OEM/ODM Medical Tubing Manufacturers and Medical Tubing Supplier

PEEK CNC machining is one of the most dependable routes to tight-tolerance, high-performance plastic parts. Unlike basic polymers, PEEK retains its mechanical properties at high temperatures, resists aggressive chemicals, and still cuts cleanly when the right parameters are used. For medical device engineers, this combination is hard to beat. What Makes PEEK a Strong Candidate for CNC Machining? PEEK (polyether ether ketone) is a semi-crystalline thermoplastic with a continuous service temperature around 260°C and a melting point near 343°C. It offers high tensile and flexural strength, excellent creep resistance, and low moisture absorption, which gives machined parts outstanding dimensional stability. These properties explain why industries from aerospace to medical rely on PEEK for components that must withstand repeated sterilization, chemical exposure, and mechanical stress. Relative performance of unfilled PEEK (illustrative scores from typical published data) Tensile strength 85 Flexural strength 80 Thermal stability 95 Chemical resistance 90 Wear resistance 88 Machinists also appreciate that PEEK is available in several grades - unfilled, glass-filled, carbon-fiber-filled, and medical grade. The choice affects chip formation, tool wear, and final part properties. Unfilled PEEK is the easiest to machine and gives a clean surface, while reinforced grades add stiffness but require tougher tooling. The semi-crystalline structure also means parts retain their mechanical performance after sterilization cycles, which is a deciding factor for reusable medical instruments. PEEK CNC Machining Best Practices: What Works in Real Production PEEK behaves differently from metal or standard plastics. It produces long, stringy chips rather than broken chips, so chip control is essential. The material is also sensitive to heat: too much friction can cause local melting or surface roughness. Use sharp carbide or polycrystalline diamond (PCD) tools. Carbide is enough for most jobs; PCD reduces wear when machining filled PEEK. Feed and speed matter. A common starting point is 100-150 m/min cutting speed with light chip loads, but always confirm with the material supplier. Keep the cutting zone cool with air or, where allowed, flood coolant. This prevents stress-induced cracking and preserves tolerance. Consider annealing the PEEK blank before finishing. Annealing at 200-220°C releases internal stresses and improves dimensional stability. Remove stringy chips frequently to avoid wrapping around the tool. Dia. 4.0 mm ±0.05 mm 6.0 mm For tube-shaped components, additional care is needed to avoid wall collapse. Detailed sawing and facing advice is available in our guide on how to cut PEEK tubing. In practice, a conservative approach - slower spindle speed, sharper tool, and continuous coolant - yields the most consistent results. When the geometry includes thin walls, reduce feed rate before changing tool geometry. Medical-Grade PEEK Machining: What Changes? Medical device manufacturers cannot treat PEEK the same way as an industrial component. The raw material must meet biocompatibility requirements such as USP Class VI or ISO 10993, and the machining process must protect the part from contamination. This means dedicated equipment, filtered air, and disciplined cleanroom operating procedures. Industrial-grade vs. medical-grade PEEK machining considerations Factor Industrial PEEK Medical PEEK Material certification Standard datasheet USP Class VI / ISO 10993 Environment Standard shop Cleanroom (ISO 7 or better) Tooling restrictions Standard coolants allowed Minimize lubricant contamination Documentation Basic inspection Full batch traceability and DHR Typical use Aerospace, automotive Catheters, surgical instruments, implants In our experience, the transition from industrial to medical-grade machining is about more than the material certificate. It requires operators who understand how a single burr can compromise a device. This is why LINSTANT runs validated processes with documented traceability for every batch. Where CNC Machined PEEK Parts Are Used in Medical Devices CNC machined PEEK appears throughout modern medical devices. You will find it in catheter fittings, endoscope handles, surgical tool insulators, and components for heart-assist pumps. Its ability to be sterilized again and again, without losing mechanical performance, makes it an ideal metal replacement. PEEK also performs well under compressive load, so it appears in valve seats, pump housings, and clamping mechanisms where dimensional stability is critical. For prototypes, CNC machining is often the fastest way to validate a design before moving to injection molding. If you are prototyping a new device or moving into production, LINSTANT can support you with several PEEK product forms designed to integrate directly into a CNC workflow: CNC-Machined PEEK Components for Medical Device ManufacturingThis product listing covers PEEK machined parts suited for CNC workflows, offering high precision, biocompatibility, and heat resistance. It is relevant here as a direct option for prototyping or production runs.View Product → PEEK Tubing with Precise Dimensional Tolerances and Multi-Lumen OptionsExplore PEEK tubing with inner diameters from 0.10 mm and temperature resistance above 250°C, plus multi-lumen and balloon tubing variants. Ideal for cardiovascular, spinal, and other interventional applications.View Product → PEEK Injection Molding Services for High-Temperature, Sterilizable Implant ComponentsPEEK injection molding enables clean-room production, close-to-bone modulus, and radiolucency. This service is highlighted for projects requiring complex geometries, cost control, and compliance with implant regulations.View Product → About Ningbo LINSTANT Polymer Materials Co., Ltd. Ningbo LINSTANT Polymer Materials Co., Ltd. was established in 2014 and has since grown into a national-level high-tech enterprise with over 500 professional staff members. The company is committed to transcending the role of a traditional component supplier, striving to become an integral part of its customers' products. From precise matching during the collaborative design phase to reliability assurance during manufacturing, LINSTANT deeply integrates into the core value chain of its customers' products, transforming catheter technology into a core competitive advantage for their products. Through continuous technological innovation and stringent quality control, we are capable of providing medical device companies with safer, more precise, and more technologically advanced customised catheter system solutions. In addition to CNC-machined PEEK parts, LINSTANT offers extrusion, molding, secondary operations, and surface treatment under one roof. Visit our OEM/ODM page to see how we handle custom projects from design to validation. Frequently Asked Questions about PEEK CNC Machining Is PEEK difficult to CNC machine? No. With sharp tools and controlled heat, PEEK machines predictably and produces clean, tight-tolerance parts. What is the best PEEK grade for CNC machining? Unfilled natural PEEK is easiest to machine; carbon-filled PEEK adds stiffness but accelerates tool wear. What tolerances can you achieve with PEEK machining? Small machined PEEK parts commonly hold ±0.05 mm. Larger or thin-wall parts may need ±0.1 mm. How does PEEK compare with PTFE or PI? PEEK is stronger and stiffer than PTFE and easier to machine than PI, while still offering excellent thermal resistance. Is machined PEEK safe for medical devices? Yes, when you use medical-grade PEEK and manufacture under cleanroom conditions with proper process controls. Why is PEEK so popular in medical manufacturing? It survives repeated sterilization, withstands chemicals, and maintains mechanical integrity under long-term loading. .article-section table{display: table!important;} .article-section thead{display: table-header-group!important;} .article-section tbody{display: table-row-group!important;} .article-section tr{display: table-row!important;} .article-section th{display: table-cell!important;} .article-section td{display: table-cell!important;} .article-section caption{caption-side:bottom;font-size:16px;margin-bottom:12px;font-style:italic;color:#808080;} .article-section th{font-weight:bold;border:1px solid #cccccc;padding:8px;} .article-section td{border:1px solid #cccccc;padding:8px;} .article-section ol{margin-bottom:12px;list-style-type:decimal;list-style-position:inside;padding-left:0;} .article-section ul{margin-bottom:12px;list-style-type:disc;list-style-position:inside;} .article-section li{list-style:inherit;font-size:16px;margin-bottom:6px;} .article-section h2{font-size:22px;font-weight:bold;text-align:left;margin-bottom:12px!important;} .article-section h3{font-size:16px;font-weight:bold;text-align:left;margin-bottom:12px;} .article-section p{font-size:16px!important;margin-bottom:12px;} .article-section{margin-bottom:32px;padding:24px;border:1px solid #e6eef5;border-radius:12px;background:#fafcff;} .article-section .chart-container{width:440px;margin:16px auto;text-align:center;} .article-section .chart-caption{caption-side:bottom;font-size:14px;color:#808080;margin-bottom:8px;font-style:italic;} .article-section .bar-item{display:flex;align-items:center;margin-bottom:8px;font-size:14px;} .article-section .bar-label{width:150px;text-align:right;padding-right:12px;color:#333;font-size:14px;} .article-section .bar-track{flex:1;background:#f0f0f0;border-radius:6px;height:24px;overflow:hidden;} .article-section .bar-fill{background:#0077b6;height:100%;color:#fff;line-height:24px;font-size:13px;padding-right:8px;text-align:right;border-radius:6px;} .article-section .chart-container svg{width:100%;height:auto;} .article-section .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:16px;} .article-section .faq-item{background:#f4f9ff;border-left:4px solid #0077b6;padding:16px;border-radius:8px;} .article-section .faq-item h3{font-size:17px;color:#003566;margin:0 0 6px;} .article-section .faq-item p{margin:0;font-size:15px;line-height:1.5;} .article-section > a[data-product-card="true"]{display:inline-block;padding:14px 20px;margin:10px 12px 10px 0;background:#e7f2fa;border:2px solid #0077b6;border-radius:10px;text-decoration:none;color:#0077b6;font-weight:bold;font-size:16px;} .article-section > a[href="/product/peek/peek-machined-parts.html"]::after{content:"PEEK Machined Parts";} .article-section > a[href="/product/peek/peek-tubing.html"]::after{content:"PEEK Tubing";} .article-section > a[href="/product/peek/peek-injection-molding.html"]::after{content:"PEEK Injection Molding";} @media (max-width:640px){ .article-section .chart-container{width:100%;} .article-section .faq-grid{grid-template-columns:1fr;} .article-section{padding:16px;} .article-section .bar-label{width:110px;} } .product-card{display:block;margin:20px 0;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;font-style:normal;background:#fff} .pc-inner{display:flex;text-decoration:none;color:inherit;align-items:center;min-height:120px} .pc-img{width:160px;min-width:160px;aspect-ratio:4/3;height:auto;min-height:120px;object-fit:cover;flex-shrink:0;display:block;align-self:stretch} .pc-body{padding:12px 16px;flex:1;min-width:0;display:flex;flex-direction:column;align-self:stretch;justify-content:center} .pc-title{display:block;font-size:15px;font-weight:600;color:#111;margin:0 0 6px;line-height:1.4} .pc-desc{display:-webkit-box;font-size:13px;color:#6b7280;margin:0 0 8px;line-height:1.5;overflow:hidden;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical} .pc-cta{display:block;font-size:13px;font-weight:600;color:#2D6ED7;margin-top:auto} .pc-inner:hover .pc-title{text-decoration:underline} .article-section a:not(.pc-inner),article a:not(.pc-inner){color:#2D6ED7}.pc-cta{color:#2D6ED7!important}

Choosing between polyamide and polyimide for a medical catheter component is a decision that impacts device performance, manufacturing cost, and regulatory risk. The practical answer is straightforward: polyamide is the right choice when flexibility, kink resistance, and budget are the priority; polyimide is the right choice when thin-wall strength, thermal stability, and dimensional precision are critical. The molecular difference explains the performance gap. Polyamide consists of flexible amide chains that make the material tough and ductile but limit its heat resistance. Polyimide contains rigid imide rings that withstand far higher temperatures but reduce elongation at break. In this article, we compare both polymers across the properties that matter most in medical tubing and catheter manufacturing. What Is Polyamide (PA)? Polyamide, commonly known as nylon, is a semi-crystalline thermoplastic with repeating amide bonds. The most common medical grades are PA11 and PA12, which offer a balance of toughness, flexibility, and processability. PA6 and PA66 are also used in non-implantable device components where higher stiffness is required. Key properties of polyamides include: Tensile strength between 50 and 90 MPa, varying with moisture content and grade. High elongation at break, often exceeding 200% for PA12, which gives excellent kink resistance in thin-wall tubing. Continuous service temperature of 100 to 120°C, with short-term peaks around 150°C. Water absorption of 1 to 3%, which can cause dimensional change and a slight reduction in stiffness. Low material cost and excellent extrudability, making it a default choice for cost-sensitive components. Multi-lumen Tubing for Simultaneous Access in Medical CathetersMulti-lumen tubing features multiple channels within a single tube, enabling simultaneous passage of guidewires, medications, and gases. It offers customizable lumen configurations up to 10, good mechanical properties, and biocompatibility, making it suitable for complex interventional procedures.View Product → In medical device manufacturing, polyamide is widely used for flexible catheter shafts, balloon tubing, and multi-lumen extrusion. PA tubes are frequently co-extruded with other polymers to create a device with a soft, kink-resistant body and a rigid proximal section. Polyamide also works well in heat-shrink applications, where its low melting point and good bondability create reliable joints. What Is Polyimide (PI)? Polyimide is a high-performance polymer with imide rings in its backbone. It is available in both thermoset and thermoplastic forms, and it is used in medical devices primarily as a thin-wall tubing material for catheter shafts, guide catheters, and micro catheters. Key properties of polyimides include: Tensile strength of 120 to 200 MPa in drawn or reinforced grades. Continuous service temperature of 250 to 300°C, with short-term peaks above 400°C. Low elongation at break (5 to 15%), providing high pushability and torque transmission. Moisture absorption below 0.3%, keeping dimensions stable in humid environments. Exceptional resistance to hydrolysis, solvents, gamma radiation, and EtO sterilisation. Medical Polyimide Tubing with Thin Walls and High ModulusMedical polyimide tubing combines strength, wear resistance, and ultra-high temperature tolerance. Its thin walls maximize inner lumen while maintaining high modulus, preventing buckling in tortuous anatomy, ideal for neurovascular and coronary catheters.View Product → The combination of high modulus and thin wall is what makes polyimide so attractive for neurovascular catheters, coronary micro catheters, and guide catheters. A thinner wall for the same outer diameter gives a larger inner lumen for wire crossing, while the high modulus prevents buckling during navigation through tortuous anatomy. Polyamide vs Polyimide: Head-to-Head Comparison When these two materials are placed side by side, the differences in performance and cost become immediately visible. The table below summarises the key engineering properties that device manufacturers have to evaluate during material selection. Table 1: Property comparison of polyamide (PA) and polyimide (PI) Property Polyamide (PA) Polyimide (PI) Chemical structure Amide bonds Imide rings Continuous service temperature 100-120°C 250-300°C Tensile strength 50-90 MPa 120-200 MPa Elongation at break 100-300% 5-15% Water absorption 1-3% <0.3% Radiation resistance Moderate Excellent Chemical resistance Good to common solvents Excellent to most chemicals Relative material cost 1x 5-10x Processing method Extrusion, injection moulding Solution casting, specialised extrusion The thermal gap is the most obvious differentiator. Based on published material datasheets, polyamide tops out at around 120°C continuous service, whereas polyimide can operate up to 300°C. For medical devices that undergo heat-sealing, laser welding, or high-temperature tip-forming, this difference is decisive. 0°C 100°C 200°C 300°C 400°C PA (Nylon): 120°C PI: 300°C Mechanical and Thermal Properties in Practice In real-world catheter design, the mechanical behaviour of a polymer tube is defined by tensile strength, elongation at break, and flexural modulus. Polyamide's high elongation makes a 0.15 mm wall tube extremely kink-resistant when bent around an 8 to 10 mm radius. Polyimide's high tensile strength and low elongation allow a 0.05 mm wall tube to carry the torque and pushing force needed to reach distal anatomy, but it can kink if bent sharply. Thermal Mech Flex Chem Elec Cost Polyamide Polyimide This is why many device designers use a composite approach. A polyimide shaft provides pushability and torque response, while a softer polymer—often polyamide or Pebax—is bonded to the distal section to improve flexibility and trackability. A PI-reinforced tube with a polyamide outer layer combines the advantages of both materials: thin-wall stiffness for navigating tortuous anatomy and a flexible, kink-resistant tip for safe crossing. For a deeper look into where PI wins in catheter design, read our article on the key performance characteristics of medical polyimide tubing. PI layer Wall 0.03-0.10 mm Lumen Guidewire path Cost and Procurement Considerations Cost is often the deciding factor for non-critical applications. Polyamide resin typically costs about one-fifth to one-tenth as much as polyimide material of the same volume. However, the total component cost does not scale linearly. Polyimide tubes can be extruded to very thin walls, which reduces material usage per unit length. For a device where the catheter profile must be smaller than one French size, the performance benefit of polyimide far outweighs the price premium. From a purchasing perspective, it is important to ask about traceability and tolerance. Medical polyimide tubing is available with ID/OD tolerances down to ±0.01 mm, while polyamide tubing typically has a tolerance of ±0.02 to ±0.05 mm. These tolerances directly affect final device performance and should be part of the specification review during supplier qualification. Another procurement factor is yield. Polyimide is stiffer and more fragile in thin-wall form, so it is usually handled in batch quantities and may have a higher scrap rate during winding or laser processing. Polyamide, by contrast, processes more forgivingly and is often supplied in continuous coils, which can reduce labour time in high-volume production. Selecting the Right Material for Catheter Tubing When choosing between polyamide and polyimide, use this quick decision guide: Choose polyamide (PA) when: The device needs a soft, flexible, and kink-resistant distal section. The manufacturing process does not expose the tube to temperatures above 120°C. Material cost is the dominant procurement constraint. The component is part of a multi-layer co-extrusion where bond strength and bondability are needed. Choose polyimide (PI) when: The catheter has to reach deep vascular anatomy with high torque and pushability. The tube wall needs to be as thin as possible to maximise the inner lumen. The device undergoes heat-based processing such as tip-forming, welding, or heat sealing. Sterilisation involves gamma irradiation, where PI shows exceptional stability. For further context, see our discussion on whether polyimide tubing has enough flexibility for catheter applications. PI Reinforced Tubing with Braided Layer for Enhanced PushabilityPI reinforced tubing integrates a braided or coiled layer within the polyimide wall, improving torsion control, flexibility, and pushability. This composite structure offers balanced stiffness and softness, suitable for catheters requiring precise navigation and pressure resistance.View Product → LINSTANT supplies both medical polyimide tubing and PI reinforced tubing, allowing device manufacturers to combine the stiffness of PI with the flexibility of other polymers in a single, customised catheter system. About Ningbo LINSTANT Polymer Materials Co., Ltd. Ningbo LINSTANT Polymer Materials Co., Ltd. was established in 2014 and has since grown into a national-level high-tech enterprise with over 500 professional staff members. The company is committed to transcending the role of a traditional component supplier, striving to become an integral part of its customers' products. From precise matching during the collaborative design phase to reliability assurance during manufacturing, LINSTANT deeply integrates into the core value chain of its customers' products, transforming catheter technology into a core competitive advantage for their products. Through continuous technological innovation and stringent quality control, we are capable of providing medical device companies with safer, more precise, and more technologically advanced customised catheter system solutions. FAQs About Polyamide vs Polyimide in Medical Devices 1. Is polyamide the same as polyimide? No. Polyamide (nylon) uses amide bonds, while polyimide uses imide rings. They differ significantly in thermal stability, mechanical strength, and cost. 2. Which material is better for catheter shafts? Polyimide is better for thin-wall, high-pushability shafts. Polyamide is better for flexible, kink-resistant distal sections. 3. What is the main drawback of polyimide? Cost and brittleness. PI is expensive and has low elongation at break, so it can kink or crack under sharp bending. 4. Can polyamide withstand autoclave sterilisation? Standard PA grades degrade at high humidity and temperatures above 150°C. Heat-stabilised PA12 can handle repeated cycles around 120-130°C. 5. How do they compare for electrical insulation? Polyimide is a superior dielectric with stable insulation up to 250°C. Polyamide absorbs moisture, which reduces insulation performance. 6. Are polyimide tubes available in medical grade? Yes. Medical-grade polyimide is widely used in catheters and guidewires, with proven resistance to gamma and EtO sterilisation. .article-section table{display: table!important;} .article-section thead{display: table-header-group!important;} .article-section tbody{display: table-row-group!important;} .article-section tr{display: table-row!important;} .article-section th{display: table-cell!important;} .article-section td{display: table-cell!important;} .article-section table{caption-side:bottom;font-style:italic;font-size:16px;margin-bottom:12px;color:#808080;border-collapse:collapse;width:100%;} .article-section th{font-weight:bold;border:1px solid #cccccc;padding:8px;background:#f0f4f8;} .article-section td{border:1px solid #cccccc;padding:8px;} .article-section ol{margin-bottom:12px;list-style-type:decimal;list-style-position:inside;padding-left:0;} .article-section ul{margin-bottom:12px;list-style-type:disc;list-style-position:inside;} .article-section li{list-style:inherit;font-size:16px;margin-bottom:6px;} .article-section h2{font-size:22px;font-weight:bold;text-align:left;margin-bottom:12px!important;} .article-section h3{font-size:16px;font-weight:bold;text-align:left;margin-bottom:12px;} .article-section p{font-size:16px!important;margin-bottom:12px;} .chart-wrap{width:440px;margin:20px auto;text-align:center;} @media(max-width:640px){.chart-wrap{width:100%;}} .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:12px;} .faq-item{background:#f0f7ff;border-left:4px solid #2b6cb0;padding:12px 16px;border-radius:0 4px 4px 0;} .faq-item h3{font-size:16px;color:#2b6cb0;margin-bottom:6px;} .faq-item p{font-size:14px;margin-bottom:0;} @media(max-width:640px){.faq-grid{grid-template-columns:1fr;}} .article-section a[data-product-card="true"]{display:block;width:440px;margin:16px auto;padding:14px 20px;background:#f0f7ff;border:1px solid #bee3f8;border-radius:8px;text-decoration:none;color:#2b6cb0;font-weight:bold;font-size:16px;text-align:center;} .article-section a[data-product-card="true"]:hover{background:#e0efff;} @media(max-width:640px){.article-section a[data-product-card="true"]{width:100%;}} .product-card{display:block;margin:20px 0;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;font-style:normal;background:#fff} .pc-inner{display:flex;text-decoration:none;color:inherit;align-items:center;min-height:120px} .pc-img{width:160px;min-width:160px;aspect-ratio:4/3;height:auto;min-height:120px;object-fit:cover;flex-shrink:0;display:block;align-self:stretch} .pc-body{padding:12px 16px;flex:1;min-width:0;display:flex;flex-direction:column;align-self:stretch;justify-content:center} .pc-title{display:block;font-size:15px;font-weight:600;color:#111;margin:0 0 6px;line-height:1.4} .pc-desc{display:-webkit-box;font-size:13px;color:#6b7280;margin:0 0 8px;line-height:1.5;overflow:hidden;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical} .pc-cta{display:block;font-size:13px;font-weight:600;color:#2D6ED7;margin-top:auto} .pc-inner:hover .pc-title{text-decoration:underline} .article-section a:not(.pc-inner),article a:not(.pc-inner){color:#2D6ED7}.pc-cta{color:#2D6ED7!important}

Catheter design is a trade-off game. Pushability, torque control, kink resistance, lubricity, trackability and X-ray visibility all compete for the same wall thickness and lumen space. The fastest way to an effective design is not to chase a single performance number, but to fix the clinical task and anatomical pathway first, then choose the layer stack, materials and reinforcement that serve that task. That is why experienced device teams treat catheter design as a systems exercise rather than a tubing selection. Take two examples. A coronary guiding catheter needs strong torque transmission and a soft, atraumatic tip. A neurovascular micro catheter, by contrast, needs extreme flexibility and low profile, even when that sacrifices some pushability. The same raw materials can be arranged in entirely different ways to satisfy these opposing priorities. Key Performance Targets in Catheter Design Design inputs come from the intended anatomy, the device's working length, the delivery technique, and the stiffness profile required to reach the target. These inputs, not the catalogue of available materials, should drive the specification. The table below maps common clinical areas to the primary design concerns and typical material choices. Table 1: Clinical focus and corresponding catheter design priorities Clinical Focus Primary Performance Requirements Typical Material/Structure Choice Coronary / Peripheral Access Torque transmission, kink resistance, guidewire compatibility, low profile Reinforced tubing with PTFE liner and Pebax outer Neurovascular Micro-Catheter Flexibility, trackability, soft tip, low friction Polyimide or Pebax shaft with coil reinforcement and lubricious coating Balloon Dilatation Burst pressure, compliance, tip bond strength Multi-layer balloon tubing in PET or Pebax Diagnostic Angiography Radiopacity, flow rate, smooth lumen FEP or PTFE liner with braid reinforcement and radiopaque fillers Layer-by-Layer Architecture: The Backbone of Performance Modern interventional catheters are built on a three-layer principle. The inner liner establishes a smooth, low-friction lumen for guidewires and fluids. The central reinforcement controls torque, crush resistance and kink resistance. The outer jacket determines flexibility, surface lubricity and biocompatibility. Getting the sequence right is more important than choosing the most expensive polymer. Liner Reinforcement Jacket Reinforcement choice is often the turning point in a catheter design. Braided structures deliver excellent torque transfer, while coil structures deliver flexibility in tortuous anatomy. Many hybrid designs combine both to tune the shaft to the target vessel. Braid Reinforced Tubing for Enhanced Torque and Burst ResistanceThis tubing embeds metal or fiber braids between layers, boosting burst pressure, column strength, and torque transmission. Ideal for catheters needing precise torsional control, such as micro catheters and steerable sheaths.View Product → Material Selection: The Trade-Offs That Matter There is no single best catheter material. PTFE delivers unmatched lubricity and chemical resistance, but it is difficult to bond and offers limited kink resistance. PEEK has excellent stiffness and biocompatibility and can be thin-walled, but it is less lubricious. Polyimide excels in high-strength, ultra-thin-wall applications. Pebax is soft and flexible and easy to process, while TPU offers resilience and a broad durometer range. Lubricity Stiffness Thin Wall Temp. Resistance Kink Resistance PTFE PEEK Polyimide is often used in micro catheters because of its thin wall and high strength. The radar chart above is a qualitative reference for two common materials; use it as a starting point for a structured comparison, not as a substitute for bench testing. Micro Catheter for Minimally Invasive Navigation in Small VesselsWith an outer diameter under 1 mm, this catheter offers flexibility and biocompatibility for precise access to tiny vessels. Customizable stiffness and diameter changes enable safe passage in tortuous anatomy.View Product → Manufacturing Tolerance and Secondary Processes Design intent is only as good as the manufacturing capability that can hold it. A catheter shaft that is 0.02 mm oversized can cause guidewire friction, while a 0.02 mm undersized reinforcement layer can affect torque transfer. Tolerance management depends on the extrusion process, material consistency and tooling. Multi-layer co-extrusion is used to achieve precise wall control around the entire cross-section, especially where different materials must bond without weak points. This technique is one reason multilayer co-extrusion technology has become a focus in the medical consumables industry. Secondary processes add functionality: flaring for tip shaping, welding for balloons, coating for lubricity, and heat shrinking for joint protection. When these steps are performed in the same cleanroom as extrusion, the risk of contamination and dimensional drift is reduced, and the final catheter behaves closer to its design model. Guiding Catheter with Multi-Stage Design and Low-Friction LinerFeaturing a braided structure for high torque and stability, plus a soft tip to reduce vessel damage. The ultra-thin wall with large inner cavity and PTFE liner ensures smooth delivery of instruments.View Product → Partnering with a Catheter Component Manufacturer Ningbo LINSTANT Polymer Materials Co., Ltd. was established in 2014 and has since grown into a national-level high-tech enterprise with over 500 professional staff members. The company is committed to transcending the role of a traditional component supplier, becoming an integral part of its customers' products. From precise matching during the collaborative design phase to reliability assurance during manufacturing, LINSTANT deeply integrates into the core value chain of its customers' products, transforming catheter technology into a core competitive advantage for their products. Through continuous technological innovation and stringent quality control, we are capable of providing medical device companies with safer, more precise, and more technologically advanced customised catheter system solutions. 20,000 m² GMP-compliant cleanroom for extrusion, coating and secondary processing 15 imported extrusion lines for multi-layer and multi-lumen tubing, plus 8 dedicated PEEK extrusion lines Near 100 braiding, spring-coiling and coating machines, and 40 welding and forming stations ISO 13485:2016 certified quality management system For teams that need a manufacturing partner to translate a catheter concept into a reproducible device, OEM/ODM collaboration is the natural next step. LINSTANT can support design-for-manufacture reviews, material selection and process validation before volume production. Frequently Asked Questions About Catheter Design What is catheter design? Catheter design is the process of balancing lumen size, wall thickness, flexibility, torque transmission and tip performance for a specific clinical application. It typically involves selecting the right liner, reinforcement and outer jacket materials. What materials are used for medical catheters? Common medical catheter materials include PTFE, FEP, PEEK, polyimide, Pebax, TPU and polycarbonate. Each offers a different combination of lubricity, stiffness, radiopacity and processing behavior. What is the difference between braided and coil-reinforced catheters? Braiding improves torque response and kink resistance, while coiling provides better flexibility and crush resistance. Braiding suits high-torque devices; coiling suits highly flexible shafts. What is a common tolerance for medical catheter tubing? Typical OD and ID tolerances for medical tubing are in the range of ±0.02 mm to ±0.05 mm, depending on material, wall thickness and dimensions. Tight tolerances are critical for guidewire compatibility and burst pressure. What is the difference between a guiding catheter and a micro catheter? A guiding catheter provides a stable, high-torque channel to deliver devices. A micro catheter is designed for deep distal access in tortuous anatomy, with a smaller profile and higher flexibility. Does LINSTANT offer custom catheter design and manufacturing? Yes. LINSTANT provides OEM/ODM services for medical device companies, covering extruded tubing, reinforced tubing, balloon tubing, heat-shrink products and secondary operations such as coating and welding. .article-section table{display:table!important;width:100%;border-collapse:collapse;margin-bottom:12px;} .article-section thead{display:table-header-group!important;} .article-section tbody{display:table-row-group!important;} .article-section tr{display:table-row!important;} .article-section th{display:table-cell!important;font-weight:bold;border:1px solid #cccccc;padding:8px;} .article-section td{display:table-cell!important;border:1px solid #cccccc;padding:8px;} .article-section caption{caption-side:bottom;font-size:16px;margin-bottom:12px;font-style:italic;color:#808080;} .article-section ol{margin-bottom:12px;list-style-type:decimal;list-style-position:inside;padding-left:0;} .article-section ul{margin-bottom:12px;list-style-type:disc;list-style-position:inside;padding-left:0;} .article-section li{list-style:inherit;font-size:16px;margin-bottom:6px;} .article-section h2{font-size:22px;font-weight:bold;text-align:left;margin-bottom:12px!important;} .article-section h3{font-size:16px;font-weight:bold;text-align:left;margin-bottom:12px;} .article-section p{font-size:16px!important;margin-bottom:12px;} .chart-container{width:440px;margin:0 auto;} .chart-container svg{width:100%;height:auto;display:block;} @media(max-width:640px){.chart-container{width:100%;}} .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:12px;} .faq-item{background:#f7f9fc;border-left:4px solid #2c7be5;border-radius:8px;padding:12px 16px;} .faq-item h3{margin-top:0;color:#2c7be5;} .faq-item p{margin-bottom:0;} @media(max-width:640px){.faq-grid{grid-template-columns:1fr;}} .product-card{display:block;margin:20px 0;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;font-style:normal;background:#fff} .pc-inner{display:flex;text-decoration:none;color:inherit;align-items:center;min-height:120px} .pc-img{width:160px;min-width:160px;aspect-ratio:4/3;height:auto;min-height:120px;object-fit:cover;flex-shrink:0;display:block;align-self:stretch} .pc-body{padding:12px 16px;flex:1;min-width:0;display:flex;flex-direction:column;align-self:stretch;justify-content:center} .pc-title{display:block;font-size:15px;font-weight:600;color:#111;margin:0 0 6px;line-height:1.4} .pc-desc{display:-webkit-box;font-size:13px;color:#6b7280;margin:0 0 8px;line-height:1.5;overflow:hidden;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical} .pc-cta{display:block;font-size:13px;font-weight:600;color:#2D6ED7;margin-top:auto} .pc-inner:hover .pc-title{text-decoration:underline} .article-section a:not(.pc-inner),article a:not(.pc-inner){color:#2D6ED7}.pc-cta{color:#2D6ED7!important}

When a medical device is placed in the body, the first question is not "does it work?" but "is it safe?" Polyetheretherketone (PEEK) has answered that question for decades. Its biocompatibility is not a marketing phrase; it comes from a chemically stable backbone that does not release harmful leachables, does not degrade in bodily fluids, and does not provoke chronic inflammation. For catheters, delivery systems, and implantable components, PEEK has become a default choice when engineers need both structural reliability and tissue tolerance. PEEK Biocompatibility: What the Term Really Means Biocompatibility is not a single material property. It describes the ability of a material to perform with an appropriate host response in a specific application. For PEEK, that response has been repeatedly documented in ISO 10993 tests and clinical use. PEEK's aromatic backbone contains ether and ketone groups arranged in a repeating unit. This structure makes the polymer highly resistant to hydrolysis, acids, bases, and organic solvents. It does not contain plasticisers or leachable additives that could migrate into tissue. The material is also inherently free of bisphenol A (BPA) and other endocrine disruptors, which are a concern with some other polymers. According to published reviews in the Journal of Biomedical Materials Research, PEEK test articles show low cell toxicity, no significant sensitisation activity, and a minimal inflammatory response when implanted in animal models. For engineers, this means PEEK passes the standard battery of ISO 10993 biocompatibility tests required for short-term contact and long-term implantable devices, provided the material is compounded and processed under medical-grade conditions. Why PEEK Performs Well in Living Tissue One reason PEEK is so well tolerated is that its surface does not create a harsh local environment. It is chemically inert, does not corrode, and does not release metal ions. For implants placed near bone, its elastic modulus closely resembles cancellous bone, reducing stress shielding and encouraging natural loading. For catheter applications, its low friction coefficient helps prevent tissue damage during navigation. Maximum Continuous Use Temperature PEEK 250°C PTFE 260°C TPU 80°C Pebax 70°C Data from common polymer engineering references. PEEK can withstand repeated autoclave and gamma sterilisation without degradation, while many other polymers soften, embrittle, or decompose. This thermal headroom makes PEEK suitable for devices that need to survive aggressive sterilisation cycles without losing mechanical integrity. Elastic Modulus (GPa) PEEK 3.6 PTFE 0.5 UHMWPE 0.9 Titanium 110 Data from published literature and material datasheets. This closer match with bone tissue helps orthopaedic implants integrate without stress shielding. In vascular devices, the moderate stiffness of PEEK allows a guide wire or catheter shaft to maintain pushability while still bending through tortuous anatomy. Medical-Grade PEEK: Grades and Standards Not all PEEK is equal. Medical-grade PEEK is manufactured under controlled compounding and validated processes, and it must meet specifications such as ASTM F2026 for PEEK. These standards define acceptable limits for extractables, injectables, and mechanical properties. Industrial PEEK can contain additives or fillers that are not suitable for in-vivo contact. When a PEEK component is used in a medical device, the supplier should provide evidence of batch traceability and biocompatibility testing on the final formulation. A responsible manufacturer will run the material through cell toxicity, sensitisation, and implantation studies according to ISO 10993, and document those results. PEEK is also known for its outstanding radiation stability: it retains its properties after gamma and electron-beam sterilisation, which is a key advantage over materials that degrade or discolour. For engineers, the takeaway is straightforward: choose a PEEK grade and a supplier that comply with the relevant medical device regulations. The biocompatibility of the raw material does not automatically transfer to the finished component if the manufacturing process introduces contamination or changes the surface chemistry. Bioinert vs Bioactive: When Surface Modification Is Needed PEEK is a bioinert material, which means it does not actively bond with bone tissue. That is not a flaw for catheter and soft-tissue applications, where a low response is exactly what you want. In orthopaedic and dental implants, however, engineers sometimes add surface treatments such as hydroxyapatite coatings, plasma spraying, or chemical etching to improve bone integration. Surface modification does not change the bulk biocompatibility of PEEK; it adds a controlled surface layer that encourages cell attachment. Many of these treatments are applied to the finished component, so the underlying PEEK still meets ISO 10993 requirements. For medical tubing, the practical concern is more often about maintaining a clean, smooth surface after extrusion and secondary processing, which we cover next. How PEEK Biocompatibility Is Maintained During Processing Even a flawless PEEK resin can lose its biocompatibility if the machining or extrusion process introduces contamination. Lubricants, metal shavings, release agents, or even airborne particles can become embedded in the part surface. That is why medical-grade PEEK components must be produced in a controlled cleanroom environment under GMP conditions. A responsible manufacturer tracks every batch from raw material to finished product. They validate the extrusion temperature profile, inspect concentricity and wall thickness, and perform post-processing such as cleaning, deburring, and surface treatment in a clean environment. The production line should be dedicated to medical polymers, not shared with industrial materials that could cross-contaminate. Our own facility includes nearly 20,000 square metres of cleanroom space and a suite of dedicated PEEK extrusion lines, injection moulding machines, and machining equipment. This level of control helps ensure that the biocompatibility documented on a material certificate is actually present in the device you receive. PEEK in Medical Tubing and Catheters Over the past decade, PEEK has earned a strong reputation in interventional cardiology, neurology, and minimally invasive surgery. PEEK tubing is used in guiding catheters, micro catheters, and balloon catheters because it offers a combination of stiffness and flexibility, low internal friction, and exceptional kink resistance. The material does not absorb water, so it maintains dimensional stability inside the body. PEEK Tubing for Medical Catheters and Multilumen ApplicationsPEEK tubing offers high strength, kink resistance, and dimensional stability for use in guiding catheters, endoscopes, and urological devices. Its biocompatibility and ability to be produced in thin-walled, multi-lumen forms support smaller, more navigable instruments.View Product → In many catheter designs, PEEK is paired with thin-wall extrusion to reduce profile while preserving mechanical performance. The ability to produce ultra-thin, multilayer PEEK tubes is a core competency at LINSTANT, and it opens the door to smaller, more navigable devices. Isometric View of PEEK Tube Outer wall PEEK layer Inner lumen 1.D. / 2.D. controlled Illustrative cross-section of a single-layer PEEK tube. PEEK heat-shrink tubing has become a reliable way to attach components, insulate splices, and protect catheter junctions without adding bulk. It shrinks tightly around the underlying structure and remains stable after gamma sterilisation. PEEK Heat Shrink Tubing for Component Insulation and ProtectionPEEK heat shrink tubing provides a tight, stable cover for joints and splices in medical devices, withstands temperatures up to 260°C, and resists radiation and corrosion. Its reliable insulation makes it suitable for critical connections.View Product → For components with complex geometry, such as manifold bodies, jackets, or radiopaque markers, injection-moulded or machined PEEK parts can deliver tight tolerances and repeatability. Machined PEEK parts are also useful in small-batch or early-prototype programmes where tooling costs are not yet justified. Machined PEEK Parts for Complex Medical Device ComponentsMachined PEEK parts deliver precise tolerances for manifolds, jackets, and radiopaque markers in medical devices. They are ideal for prototypes and small batches, offering strength and biocompatibility without tooling costs.View Product → How to Choose a PEEK Tubing Supplier Selecting a supplier is as important as selecting the material. A reliable PEEK tubing partner should operate a cleanroom environment, maintain GMP compliance, and demonstrate process control over extrusion and post-processing. Ask these questions before awarding a contract: Do you run dedicated PEEK extrusion lines with controlled temperature profiles? Can you produce ultra-thin wall or multilayer structures with tight concentricity? How do you document batch traceability and testing results? Can you provide ISO 10993 test reports for the finished component? Do you offer secondary operations such as flaring, tipping, and surface treatment? If your supplier can answer these with documented evidence, the risk is low. At LINSTANT, we treat PEEK as a core material family and have built an OEM/ODM capability that supports customers from design research through to serial production. Company Introduction Ningbo LINSTANT Polymer Materials Co., Ltd. was established in 2014 and has since grown into a national-level high-tech enterprise with over 500 professional staff members. The company is committed to transcending the role of a traditional component supplier, striving to become an integral part of its customers' products. From precise matching during the collaborative design phase to reliability assurance during manufacturing, LINSTANT deeply integrates into the core value chain of its customers' products, transforming catheter technology into a core competitive advantage for their products. Through continuous technological innovation and stringent quality control, we are capable of providing medical device companies with safer, more precise, and more technologically advanced customised catheter system solutions. Contact us to discuss your next PEEK catheter project. Frequently Asked Questions about PEEK Biocompatibility Is PEEK biocompatible? Yes, medical-grade PEEK is widely considered biocompatible. It has passed ISO 10993 tests for cytotoxicity, sensitisation, and irritation. Does PEEK pass ISO 10993? PEEK raw materials and finished components can be validated to ISO 10993 requirements. Can PEEK be used in blood contact? Yes, PEEK is used in catheters and vascular devices. Its low friction and chemical inertness help minimise thrombosis risk. Is PEEK radiolucent? PEEK is radiolucent, which means it does not block X-rays. This can be an advantage when a device needs to be visible in imaging. How is PEEK biocompatibility tested? Standard testing includes cell culture, animal implantation, and chemical extract analysis according to ISO 10993. What is medical grade PEEK? Medical grade PEEK is produced under controlled compounding with batch traceability and validated mechanical properties per ASTM F2026. .article-section{font-family:Arial,sans-serif;color:#333;line-height:1.6;margin-bottom:24px;} .article-section p{font-size:16px!important;margin-bottom:12px;} .article-section h2{font-size:22px;font-weight:bold;text-align:left;margin-bottom:12px!important;color:#1a1a1a;border-bottom:2px solid #2c7fb8;padding-bottom:6px;} .article-section h3{font-size:16px;font-weight:bold;text-align:left;margin-bottom:12px;color:#2c7fb8;} .article-section ul{margin-bottom:12px;list-style-type:disc;list-style-position:inside;padding-left:0;} .article-section ol{margin-bottom:12px;list-style-type:decimal;list-style-position:inside;padding-left:0;} .article-section li{list-style:inherit;font-size:16px;margin-bottom:6px;} .article-section table{display:table!important;} .article-section thead{display:table-header-group!important;} .article-section tbody{display:table-row-group!important;} .article-section tr{display:table-row!important;} .article-section th{display:table-cell!important;font-weight:bold;border:1px solid #cccccc;padding:8px;} .article-section td{display:table-cell!important;border:1px solid #cccccc;padding:8px;} .article-section caption{caption-side:bottom;font-size:16px;margin-bottom:12px;font-style:italic;color:#808080;} .article-section svg{display:block;width:440px;height:auto;margin:16px auto;} .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;} .faq-item{background:#f0f7ff;border-left:4px solid #2c7fb8;border-radius:6px;padding:12px;} .faq-item h3{margin-bottom:6px;font-size:16px;color:#2c7fb8;} .faq-item p{margin-bottom:0;font-size:14px;} @media(max-width:640px){.article-section svg{width:100%;}.faq-grid{grid-template-columns:1fr;}} .product-card{display:block;margin:20px 0;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;font-style:normal;background:#fff} .pc-inner{display:flex;text-decoration:none;color:inherit;align-items:center;min-height:120px} .pc-img{width:160px;min-width:160px;aspect-ratio:4/3;height:auto;min-height:120px;object-fit:cover;flex-shrink:0;display:block;align-self:stretch} .pc-body{padding:12px 16px;flex:1;min-width:0;display:flex;flex-direction:column;align-self:stretch;justify-content:center} .pc-title{display:block;font-size:15px;font-weight:600;color:#111;margin:0 0 6px;line-height:1.4} .pc-desc{display:-webkit-box;font-size:13px;color:#6b7280;margin:0 0 8px;line-height:1.5;overflow:hidden;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical} .pc-cta{display:block;font-size:13px;font-weight:600;color:#2D6ED7;margin-top:auto} .pc-inner:hover .pc-title{text-decoration:underline} .article-section a:not(.pc-inner),article a:not(.pc-inner){color:#2D6ED7}.pc-cta{color:#2D6ED7!important}

Is Medical PEEK Tubing Biocompatible Medical PEEK tubing is generally recognized as biocompatible and is widely used in devices that require body contact, thanks to its stable chemical structure, high purity manufacturing options, and resistance to degradation inside the body. PEEK, short for polyether ether ketone, is a high performance thermoplastic that combines mechanical strength, thermal stability, and chemical resistance in a way that supports its long-standing use across implantable and body-contact medical components. The sections that follow explain the material characteristics behind this biocompatibility profile, compare PEEK against general expectations for other engineering polymers, and outline what manufacturers should evaluate when specifying medical PEEK tubing for a device program. What Makes PEEK Suitable for Body-Contact Applications PEEK is a semi-crystalline polymer that maintains a stable molecular structure under mechanical stress, elevated temperature, and repeated chemical exposure. This structural stability is a central reason the material resists breaking down inside the body over time, which is a baseline requirement for any polymer considered for body-contact or implantable use. Unlike some polymers that soften or leach components under physiological conditions, PEEK retains its dimensional and mechanical properties across a wide range of exposure scenarios. Medical PEEK Tubing Cross Section Homogeneous single-material wall supports consistent surface properties Material Characteristics That Support Biocompatibility Stable molecular structure that resists breakdown under physiological conditions Low reactivity with bodily fluids and common sterilization chemistries Consistent surface characteristics across the tubing wall Compatibility with high purity, controlled manufacturing environments High Temperature Tolerance and Repeated Sterilization One of the defining characteristics of PEEK is its ability to operate stably in environments up to 250 degrees Celsius while maintaining its mechanical properties. This high temperature tolerance allows medical PEEK tubing to withstand repeated sterilization cycles under high temperature conditions without the softening or dimensional drift that can affect lower temperature polymers. Property Retention Across Sterilization Cycles Cycle 1 Cycle N PEEK Standard Polymer Because it withstands temperatures above 250 degrees Celsius, medical grade PEEK tubing can go through repeated high temperature sterilization procedures while retaining its high crystallinity and thermal stability, a combination that supports its use in reusable or repeatedly processed device components. Mechanical Strength and Fracture Toughness PEEK combines high strength with high fracture toughness and stable dimensional performance, meaning the material resists both breaking under load and gradually deforming over time. This combination of hardness and toughness is uncommon among engineering polymers, most of which favor one property at the expense of the other. Mechanical Characteristics of PEEK Tensile Strength High Fracture Toughness High Dimensional Stability High Flexibility Alone Moderate General characteristics associated with PEEK material grades How Strong Is PEEK Tubing in Practice In practical terms, PEEK tubing can hold precise dimensions under mechanical load, which is why it is often selected for shaft components that need to transmit force without stretching, flattening, or losing roundness during device use. Chemical Stability, Wear Resistance, and Flame Resistance Beyond mechanical performance, PEEK exhibits good chemical stability, flame resistance, and wear resistance, three characteristics that matter throughout both manufacturing and clinical use. Chemical stability protects the tubing from degradation when exposed to cleaning agents, bonding solvents, and bodily fluids. Wear resistance supports consistent performance in applications involving repeated contact or sliding motion against other components. Key Resistance Characteristics Chemical Wear Flame Thermal Is PEEK Tubing Chemically Resistant Yes, PEEK tubing is generally considered chemically resistant across a broad range of common solvents, cleaning agents, and physiological fluids encountered in both manufacturing and clinical settings, which supports its selection for components requiring long-term chemical exposure stability. How PEEK Tubing Compares to Other Engineering Polymers Device engineers often compare PEEK against other high performance polymers when selecting a tubing material for a specific application. The radar chart below illustrates a general comparison across factors commonly evaluated during material selection. PEEK vs General Engineering Polymers Strength Thermal Tolerance Wear Resistance Flexibility Chem. Resistance Toughness PEEK General Polymer Is PEEK Tubing Flexible PEEK tubing offers moderate flexibility rather than high flexibility, since its strength and rigidity characteristics are generally prioritized over bendability. In applications where higher flexibility is required, engineers typically adjust wall thickness or combine PEEK with a secondary flexible component rather than relying on PEEK alone for a highly flexible shaft. Precision, Crystallinity, and Manufacturing Consistency PEEK offers high precision manufacturing potential along with high crystallinity, which together support better thermal stability and repeatable dimensional outcomes across a production run. This consistency is particularly relevant for thin wall medical PEEK tubing, where small variations in wall thickness or roundness can affect how the tubing performs once integrated into a finished device. Advantages Summarized High precision manufacturing supports tight tolerance requirements Hardness combined with toughness supports durability under mechanical stress Withstands temperatures above 250 degrees Celsius, supporting repeated high temperature sterilization High crystallinity contributes to better thermal stability across processing and use Common Applications for Medical PEEK Tubing The properties described above make PEEK tubing suitable for a range of device categories where strength, thermal stability, and chemical resistance are simultaneously required. The table below summarizes typical application areas. Common applications for medical PEEK tubing Application Area Relevant PEEK Property Catheter Shaft Components Strength and dimensional stability Reusable Device Components High temperature sterilization tolerance Wear Contact Components Wear resistance and toughness Chemical Exposure Components Chemical stability and flame resistance Manufacturers sourcing medical PEEK tubing for catheters typically evaluate wall thickness, dimensional tolerance, and surface finish alongside these baseline material properties to confirm the tubing matches the mechanical demands of the specific device. About LINSTANT: A Source for Medical PEEK Tubing NINGBO LINSTANT POLYMER MATERIALS CO., LTD. was established in 2014 and has specialized in extrusion processing, coating, and post-processing technology for medical polymer tubing. As a medical PEEK tubing supplier, the company maintains a commitment to precision, safety, diverse process development capabilities, and consistent output for device manufacturers. LINSTANT operates a purification workshop of nearly 20,000 square meters that follows GMP-aligned practices, supported by 15 imported extrusion lines with various screw sizes and single, double, and tri-layer co-extrusion capability, eight PEEK extrusion lines, two injection molding lines, close to 100 sets of weaving, springing, and coating equipment, and forty sets of welding and forming equipment. Business scope includes extruded single and multi-layer tubing, single and multi-lumen tubing, single, double, and tri-layer balloon tubing, coil and braided reinforced sheaths, specialty PEEK and PI tubing, and various surface treatment solutions. PEEK Material Highlights Summary of PEEK material characteristics referenced by LINSTANT Characteristic Description Temperature Tolerance Stable operation up to 250 degrees Celsius Mechanical Profile High strength with high fracture toughness Chemical Behavior Good chemical stability and flame resistance Surface Performance Good wear resistance and biocompatibility Frequently Asked Questions Q1. What is medical PEEK tubing? Medical PEEK tubing is tubing manufactured from polyether ether ketone, a high performance thermoplastic known for strength, thermal stability, and biocompatibility in medical device applications. Q2. What is PEEK tubing used for? It is used in catheter shaft components, reusable device parts, and other applications where strength, dimensional stability, and chemical resistance are required together. Q3. Why is PEEK used in medical devices? PEEK combines high strength, thermal stability, chemical resistance, and biocompatibility in a single material, which reduces the need to trade off one property for another during device design. Q4. What are the benefits of medical PEEK tubing? Benefits include high precision manufacturing, combined hardness and toughness, tolerance for repeated high temperature sterilization, and stable dimensional performance over time. Q5. What is medical grade PEEK? Medical grade PEEK refers to PEEK material processed and controlled to standards suitable for use in medical devices, including body-contact and reusable components. Q6. How strong is PEEK tubing? PEEK tubing offers high tensile strength combined with high fracture toughness, allowing it to resist both breaking under load and gradual deformation over repeated use. Q7. Is PEEK tubing flexible? PEEK tubing offers moderate flexibility rather than high flexibility, since its design generally prioritizes strength and dimensional stability over bendability. Q8. Is PEEK tubing wear resistant? Yes, PEEK tubing exhibits good wear resistance, which supports consistent performance in applications involving repeated contact or sliding motion against other components. Q9. Is PEEK tubing chemically resistant? Yes, PEEK tubing shows good chemical stability across many common solvents, cleaning agents, and physiological fluids encountered in manufacturing and clinical use. Q10. Can PEEK tubing withstand high temperatures Yes, PEEK tubing can operate stably in environments up to 250 degrees Celsius, allowing it to withstand repeated sterilization under high temperature conditions. .li-pk-section{margin-bottom:40px;} .li-pk-section h2{font-size:22px;font-weight:bold;text-align:left;line-height:1.4;margin-bottom:15px;color:#005c8f;padding-left:14px;border-left:5px solid #008cd6;} .li-pk-section h3{font-size:16px;font-weight:bold;text-align:left;line-height:1.6;margin-bottom:15px;color:#0069a3;} .li-pk-section p{font-size:16px;text-align:left;line-height:2;margin-bottom:15px;color:#333333;} .li-pk-section ul{margin-bottom:15px;padding-left:0;} .li-pk-section ol{margin-bottom:15px;padding-left:0;} .li-pk-section li{font-size:16px;line-height:2;margin-bottom:5px;color:#333333;} .li-pk-intro{background:linear-gradient(135deg,#eaf5fc 0%,#dcedf8 100%);border-radius:10px;padding:24px;} .li-pk-what{background-color:#ffffff;border:1px solid #dbe9f5;border-radius:10px;padding:24px;} .li-pk-thermal{background:linear-gradient(180deg,#f2f9fd 0%,#ffffff 100%);border-radius:10px;padding:24px;} .li-pk-strength{background-color:#ffffff;padding:24px;border-radius:10px;box-shadow:0 1px 4px rgba(0,140,214,0.08);} .li-pk-chemical{background:linear-gradient(135deg,#e8f3fb 0%,#f6fbfd 100%);border-radius:10px;padding:24px;} .li-pk-compare{background-color:#ffffff;padding:24px;border-radius:10px;border:1px solid #dbe9f5;} .li-pk-precision{background:linear-gradient(180deg,#f0f8fc 0%,#ffffff 100%);border-radius:10px;padding:24px;} .li-pk-applications{background:linear-gradient(135deg,#e3f0f9 0%,#f4fafd 100%);border-radius:10px;padding:24px;} .li-pk-company{background:linear-gradient(135deg,#dfeefa 0%,#cfe6f6 100%);border-radius:10px;padding:24px;} .li-pk-faq{background-color:#ffffff;padding:24px;border-radius:10px;} .li-pk-faq h2{border-left:5px solid #008cd6;margin-bottom:20px;} .li-pk-chart-wrap{width:440px;margin:0 auto 15px auto;background-color:#ffffff;border-radius:8px;padding:10px;box-shadow:0 1px 6px rgba(0,140,214,0.10);} .li-pk-chart-wrap svg{width:100%;height:auto;display:block;} .li-pk-section table caption{caption-side:bottom;font-size:16px;margin-bottom:12px;font-style:italic;color:#808080;} .li-pk-section table thead th{background-color:#008cd6;color:#ffffff;} .li-pk-section table tbody tr:nth-child(even){background-color:#eef7fc;} .li-pk-section table tbody tr:nth-child(odd){background-color:#ffffff;} .li-pk-faq-grid{display:flex;flex-wrap:wrap;gap:16px;} .li-pk-faq-item{flex:0 0 calc(50% - 8px);background:linear-gradient(135deg,#eef7fd 0%,#e0f0fa 100%);border-left:4px solid #008cd6;border-radius:8px;padding:16px 18px;box-sizing:border-box;} .li-pk-faq-item h3{color:#005c8f;margin-bottom:8px;font-size:16px;} .li-pk-faq-item p{margin-bottom:0;font-size:16px;line-height:1.9;color:#333333;} @media only screen and (max-width:640px){ .li-pk-chart-wrap{width:100%;} .li-pk-faq-item{flex:0 0 100%;} .li-pk-section h2{font-size:20px;padding-left:10px;} .li-pk-intro,.li-pk-what,.li-pk-thermal,.li-pk-strength,.li-pk-chemical,.li-pk-compare,.li-pk-precision,.li-pk-applications,.li-pk-company,.li-pk-faq{padding:16px;} }

7 Key Properties of Medical PI Tubing Engineers Should Evaluate Medical PI tubing is valued by device engineers primarily for its combination of high tensile strength in an extremely thin wall, strong thermal stability, broad chemical resistance, tight dimensional tolerances, biocompatibility, controlled flexibility, and compatibility with reinforcement or coating processes. These seven properties, taken together, explain why polyimide is repeatedly selected as a base tubing material for catheter liners, microcatheter shafts, and other minimally invasive device components where wall thickness and mechanical reliability both matter. The sections below examine each property in detail, compare polyimide against general expectations for other tubing materials, and outline where each characteristic becomes most relevant during device design and production. Property 1: High Tensile Strength in a Thin Wall One of the most cited reasons for choosing medical PI tubing is that it can hold significant tensile strength while maintaining a very thin cross-section. This matters directly in catheter design, where every fraction of a millimeter of wall thickness can be reallocated toward a larger inner lumen or a smaller outer diameter, both of which improve device performance. Strength-to-Wall-Thickness Comparison Polyimide High Standard Nylon Moderate PTFE Moderate Polyurethane Lower Illustrative comparison of strength retained at thin wall thickness Because the material carries load efficiently at a thin gauge, ultra thin wall polyimide tubing is frequently specified for liner layers in microcatheters and other small-profile devices where every increment of wall thickness competes directly with usable lumen space. Property 2: Thermal Stability Across a Wide Temperature Range Polyimide tubing retains its mechanical and dimensional properties across a broad temperature range compared with many general purpose polymers. This becomes relevant not only during clinical use but also throughout manufacturing steps such as reflow soldering of nearby components, heat-set bonding, and sterilization-related processing, where the tubing must not soften, deform, or lose dimensional accuracy. Relative Property Retention vs Temperature Low High Temp Polyimide Standard Polymer This wide thermal stability window is one reason medical grade polyimide tubing continues to hold dimensional consistency through steps of the device assembly process that would soften or distort many alternative tubing materials. Property 3: Broad Chemical and Solvent Resistance Medical device manufacturing and clinical use both expose tubing to a range of chemical contact points, including cleaning agents, contrast media, bonding solvents, and physiological fluids. Polyimide is generally recognized for resisting degradation from many common solvents and chemicals encountered during both production and device use, which helps preserve tubing integrity over the life of the component. Common Exposure Points During Manufacturing and Use Bonding and adhesive solvents used during catheter shaft assembly Cleaning and degreasing agents used in production environments Contrast media and saline solutions encountered during procedures Coating and lubricant chemistries applied to the outer tubing surface Chemical Resistance Comparison Solvents Cleaners Body Fluids Adhesives Coatings Property 4: Tight Dimensional Tolerances and Wall Consistency Consistent inner diameter, outer diameter, and wall concentricity are essential for tubing that will later be reinforced, coated, or bonded into a multi-layer catheter shaft. Polyimide tubing manufactured through precision extrusion or solvent-cast processes can achieve narrow tolerance bands, which supports repeatable assembly and predictable mechanical behavior across a production lot. Outer Wall Inner Bore Wall Thickness and Tolerance Zones Consistent wall geometry supports predictable bonding and reinforcement This level of dimensional control is a key reason many engineering teams request thin wall microcatheter tubing built specifically to match a target inner lumen while staying within a defined outer diameter range for the finished device. Property 5: Biocompatibility for Body-Contact Applications Polyimide used in medical tubing is selected for formulations suited to body-contact applications, supporting its use as a liner material in catheters and other devices that come into contact with vascular tissue or bodily fluids during a procedure. Biocompatible polyimide tubing is typically produced under controlled manufacturing conditions to help maintain material purity and consistency from batch to batch. Why Biocompatibility Matters for Tubing Selection Device teams generally evaluate biocompatibility alongside mechanical performance rather than as a separate consideration, since a tubing material must satisfy both requirements simultaneously to be viable for catheter or introducer applications. This is one reason polyimide continues to be paired with reinforcement layers rather than replaced outright by other polymer options. Property 6: Controlled Flexibility and Predictable Bend Behavior While polyimide alone is comparatively stiff next to some elastomeric tubing materials, its bend behavior is highly predictable, which allows engineers to design catheter shafts with known flex characteristics rather than variable ones. This predictability is often more valuable in catheter design than raw flexibility alone, since a shaft with erratic bend response is harder to control during navigation. Polyimide vs General Tubing Materials Strength Thermal Stability Precision Flexibility Chem. Resistance Wall Thinness Polyimide General Polymer Because bend behavior is more predictable than flexible on its own, polyimide liners are commonly combined with reinforcement layers when a catheter design calls for both flexibility and controlled recovery, particularly in polyimide tubing for microcatheters that must track through narrow, curved vessels. Property 7: Compatibility with Reinforcement and Coating Processes A practical property that often gets less attention than raw material strength is how well a tubing substrate bonds with secondary processes such as braiding, coiling, and outer jacket coating. Polyimide surfaces generally accept braid reinforcement and secondary coatings well, which is part of why it functions effectively as a liner layer inside a multi-layer catheter shaft rather than only as a standalone tube. Process compatibility considerations for polyimide liner tubing Secondary Process Role in Finished Device Braiding Adds torque transmission and burst strength Coiling Improves kink resistance through curves Outer Jacketing Locks reinforcement and smooths outer surface Surface Treatment Adjusts lubricity and bonding characteristics This layered compatibility is why medical PI tubing for catheters is frequently supplied as a base liner component intended for further processing rather than as a finished stand-alone product. Where Medical PI Tubing Is Commonly Applied The seven properties discussed above combine to make polyimide tubing suitable across a range of minimally invasive device applications. The table below summarizes typical use cases relevant to engineers sourcing this material. Common applications for medical PI tubing Application Relevant Property Microcatheter Liners Thin wall strength and dimensional precision Guiding Catheter Liners Chemical resistance and coating compatibility Delivery System Shafts Predictable bend behavior with reinforcement Introducer Components Biocompatibility and thermal stability About LINSTANT: A Source for Medical PI Tubing NINGBO LINSTANT POLYMER MATERIALS CO., LTD. was established in 2014 and has specialized in extrusion processing, coating, and post-processing technology for medical polymer tubing. As a medical grade PI tubing supplier, the company works to support precision, consistency, and diverse process development for device manufacturers sourcing liner and shaft tubing components. LINSTANT operates a purification workshop of nearly 20,000 square meters that follows GMP-aligned practices, supported by 15 imported extrusion lines with various screw sizes and single, double, and tri-layer co-extrusion capability, eight PEEK extrusion lines, two injection molding lines, close to 100 sets of weaving, springing, and coating equipment, and forty sets of welding and forming equipment. Business scope includes extruded single and multi-layer tubing, single and multi-lumen tubing, single, double, and tri-layer balloon tubing, coil and braided reinforced sheaths, specialty PEEK and PI tubing, and various surface treatment solutions. LINSTANT Facility Overview Extrusion Tube / Year 20,000,000+ Braided Tube / Year 2,000,000+ Clean Room Area (sqm) 30,000 sqm Test and Lab Equipment 1,500+ Intellectual Property Rights 50+ Teams evaluating a custom medical PI tubing build often work directly with process engineers to define wall thickness, tolerance bands, and surface treatment needs before moving into reinforcement or coating stages, since these upstream decisions shape how the finished tubing performs once integrated into a catheter shaft. Frequently Asked Questions Q1. What is medical PI tubing? Medical PI tubing refers to polyimide tubing manufactured for use in medical devices, valued for its thin wall strength, thermal stability, and chemical resistance. Q2. What is polyimide tubing used for? It is primarily used as a liner or shaft material in catheters, microcatheters, and delivery systems where thin walls and predictable mechanical behavior are required. Q3. Why is polyimide used in medical devices? Polyimide offers a strong combination of tensile strength, dimensional precision, and chemical resistance in a thin cross-section, which supports smaller device profiles without sacrificing performance. Q4. What are the benefits of medical PI tubing? Benefits include high strength at thin wall thickness, stable performance across temperature ranges, resistance to common solvents and fluids, and tight dimensional tolerances. Q5. What applications use polyimide tubing? Applications include catheter liners, microcatheter shafts, delivery system components, and introducer tubing across cardiovascular and peripheral vascular device categories. Q6. Why is polyimide tubing used in catheters? Catheters need a liner or shaft material that maintains a small profile while resisting the mechanical and chemical stress of navigation and procedure use, which polyimide is well suited to provide. Q7. Is polyimide tubing suitable for microcatheters? Yes, thin wall polyimide tubing is commonly used in microcatheters because it allows a small outer diameter while preserving usable inner lumen space. Q8. What is a polyimide catheter liner? A polyimide catheter liner is the inner tubing layer of a catheter shaft, providing a smooth, low-friction lumen surface beneath any reinforcement or outer jacket layers. Q9. How does polyimide tubing improve catheter performance? It contributes a thin, strong, dimensionally stable base layer that supports predictable bend behavior and compatibility with reinforcement processes such as braiding or coiling. Q10. What tubing is best for catheter liners? There is no single best material for every catheter liner, since requirements vary by procedure, but polyimide is widely selected when thin wall strength and dimensional precision are priorities. .li-pit-section{margin-bottom:40px;} .li-pit-section h2{font-size:22px;font-weight:bold;text-align:left;line-height:1.4;margin-bottom:15px;color:#005c8f;padding-left:14px;border-left:5px solid #008cd6;} .li-pit-section h3{font-size:16px;font-weight:bold;text-align:left;line-height:1.6;margin-bottom:15px;color:#0069a3;} .li-pit-section p{font-size:16px;text-align:left;line-height:2;margin-bottom:15px;color:#333333;} .li-pit-section ul{margin-bottom:15px;padding-left:0;} .li-pit-section ol{margin-bottom:15px;padding-left:0;} .li-pit-section li{font-size:16px;line-height:2;margin-bottom:5px;color:#333333;} .li-pit-intro{background:linear-gradient(135deg,#eaf8fb 0%,#dff3f6 100%);border-radius:10px;padding:24px;} .li-pit-prop1{background-color:#ffffff;border:1px solid #dceef3;border-radius:10px;padding:24px;} .li-pit-prop2{background:linear-gradient(180deg,#f4fcfd 0%,#ffffff 100%);border-radius:10px;padding:24px;} .li-pit-prop3{background-color:#ffffff;padding:24px;border-radius:10px;box-shadow:0 1px 4px rgba(0,140,214,0.08);} .li-pit-prop4{background:linear-gradient(135deg,#e9f7fa 0%,#f7fdfd 100%);border-radius:10px;padding:24px;} .li-pit-prop5{background-color:#ffffff;padding:24px;border-radius:10px;border:1px solid #dceef3;} .li-pit-prop6{background:linear-gradient(180deg,#f2fbfc 0%,#ffffff 100%);border-radius:10px;padding:24px;} .li-pit-prop7{background-color:#ffffff;padding:24px;border-radius:10px;box-shadow:0 1px 4px rgba(0,140,214,0.08);} .li-pit-applications{background:linear-gradient(135deg,#e3f4f9 0%,#f4fcfd 100%);border-radius:10px;padding:24px;} .li-pit-company{background:linear-gradient(135deg,#e3f4f9 0%,#d9eef2 100%);border-radius:10px;padding:24px;} .li-pit-faq{background-color:#ffffff;padding:24px;border-radius:10px;} .li-pit-faq h2{border-left:5px solid #008cd6;margin-bottom:20px;} .li-pit-chart-wrap{width:440px;margin:0 auto 15px auto;background-color:#ffffff;border-radius:8px;padding:10px;box-shadow:0 1px 6px rgba(0,140,214,0.10);} .li-pit-chart-wrap svg{width:100%;height:auto;display:block;} .li-pit-section table caption{caption-side:bottom;font-size:16px;margin-bottom:12px;font-style:italic;color:#808080;} .li-pit-section table thead th{background-color:#008cd6;color:#ffffff;} .li-pit-section table tbody tr:nth-child(even){background-color:#f0f9fc;} .li-pit-section table tbody tr:nth-child(odd){background-color:#ffffff;} .li-pit-faq-grid{display:flex;flex-wrap:wrap;gap:16px;} .li-pit-faq-item{flex:0 0 calc(50% - 8px);background:linear-gradient(135deg,#f0fbfd 0%,#e6f6fb 100%);border-left:4px solid #008cd6;border-radius:8px;padding:16px 18px;box-sizing:border-box;} .li-pit-faq-item h3{color:#005c8f;margin-bottom:8px;font-size:16px;} .li-pit-faq-item p{margin-bottom:0;font-size:16px;line-height:1.9;color:#333333;} @media only screen and (max-width:640px){ .li-pit-chart-wrap{width:100%;} .li-pit-faq-item{flex:0 0 100%;} .li-pit-section h2{font-size:20px;padding-left:10px;} .li-pit-intro,.li-pit-prop1,.li-pit-prop2,.li-pit-prop3,.li-pit-prop4,.li-pit-prop5,.li-pit-prop6,.li-pit-prop7,.li-pit-applications,.li-pit-company,.li-pit-faq{padding:16px;} }