FEATURES

• Mold Description
  Product Materials:	FEP
  Mold Material:	S136ESR
  Number of Cavities:	2
  Glue Feeding Method:	Hot runner
  Cooling Method:	Water cooling
  Molding Cycle	2.5s

  
  

• FEP heat shrink tube

  Characteristics of FEP heat shrink tubing

  a. Extreme operating temperature range

   

  FEP heat shrink tubing has excellent temperature stability and can work stably in an extreme temperature range of -200 degrees to 200 degrees. This feature enables it to perform well in environments with various temperature requirements in medical equipment.

  b. Easy processing

  The easy processing of FEP heat shrink tubing makes it an ideal choice for medical device manufacturing. It can be heated and heat-shrunk to adapt to parts of various shapes and sizes, with a high degree of customization to meet the needs of different devices.

  c. Aging resistanc

  This heat shrink tubing can be exposed to ozone and sunlight for a long time without aging. This means that it can still maintain excellent performance in medical devices outdoors or exposed to UV rays without degrading over time.

  d. High transparency

  FEP heat shrink tubing has a lower refractive index among all plastics, so it has high transparency. This allows medical staff to observe the flow of the medium in the tube very clearly, which helps to monitor liquid or gas delivery.

  Medical Applications

  FEP heat shrink tubing has a wide range of applications in the medical field, providing excellent solutions for many key aspects of medical devices.

  First, these heat shrink tubings are being used in the manufacture of variable durometer catheters. Due to their ultra-thin walls, they can increase the stiffness of catheters without increasing the size of the device. This application eliminates the need to connect different materials or add woven fabric to the tube section to achieve multiple hardness zones, improving the control of the device.

  Secondly, FEP heat shrink tubing is widely used as an electrical insulation material in electronic medical devices. These tubings are favored for their high dielectric and resistivity properties, which not only effectively insulate, but also add little to the size of the device due to their ultra-thin walls. This property makes it an ideal material for needles used to protect the skin from electrical irritation, covering electronic components, and insulating wiring on conduits and other devices.

  In addition, FEP heat shrink tubing is used to protect, encapsulate and bundle a variety of medical device components, such as braided catheter shafts, spring coils, and radiopaque marking tape. They cover sharp edges smoothly, seal to prevent fluid leakage, and provide a strong protective layer. This is especially noticeable on equipment such as rotary spring cutters, which need to prevent debris from clogging the coil when operating at high speeds.

  Finally, FEP heat shrink tubing is also used for tube joining, in particular for welding tubes together. This joining method usually involves the use of tubes with different characteristics: a rigid tube and a flexible tube are joined.

  Why choose Ansix’s FEP heat shrink tubing over competitors’?

  Unlike other technologies in the industry, Putnam’s FEP heat shrink tubing is manufactured without any processing aids such as silicone oil, eliminating potential bonding and contamination issues commonly associated with traditional heat shrink materials. Featuring less than 5% lineal shrinkage, Putnam’s FEP shrink tubing may also provide increased tensile values and higher overall yield rates for certain bonded catheter assemblies. Recent investment into increased capacity at Ansix Medical has allowed quick turnaround time for FEP heat shrink tubing that can be as quick as 4 weeks.

  What is FEP heat shrink typically used for in medical devices?

  FEP heat shrink is possibly the most used processing aid for catheter assembly in the medical device manufacturing industry.
  
  

  Ansix Plastics’ FEP Heat Shrink Tubing Standard Sizes
  

  

  
  

  
  
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• Ansix Tech Launches Dedicated Medical FEP Heat Shrink Tubing Initiative: Redefining Precision, Value, and Reliability in Catheter Manufacturing

  In a strategic move that signals a deeper commitment to the rapidly expanding FEP heat shrink medical tubing market — estimated to reach USD 145 million in 2024 according to industry forecasts — Ansix Tech has formally announced the establishment of a dedicated project division for Medical FEP Heat Shrink Tubing [3†L43-L45]. With over 28 years of manufacturing heritage tracing back to its founding in Hong Kong in 1998, the ISO 13485:2016 certified company is leveraging its deep expertise in precision injection molding and extrusion to deliver a comprehensive solution that addresses the most persistent challenges facing medical device OEMs today: cost control, validation confidence, quality assurance, and scalable production capacity

  
  

• Bridging the Gap: From Concept to Commercial Reality

  For many catheter and medical device manufacturers, the journey from product concept to reliable, high-volume production of FEP heat shrink tubing is fraught with technical and operational hurdles. The initiation of Ansix Tech‘s Medical FEP Heat Shrink Tubing project is specifically designed to bridge this gap, offering a seamless continuum from initial prototyping through to full-scale production and assembly validation. Unlike many contract manufacturers that specialize exclusively in either prototyping or mass production, Ansix Tech positions its new initiative as an end-to-end partnership model.

   

  “The medical device industry has long been segmented between design houses and high-volume manufacturers. This creates friction, delays, and unnecessary costs,” the company’s engineering team explains. “Our FEP heat shrink tubing project eliminates that divide. Whether a client needs five meters for a clinical trial or five million meters for global market launch, they work with the same engineering and manufacturing team throughout the entire product lifecycle.”

   

  This holistic approach encompasses everything from raw material sourcing — with stringent verification of resin purity and consistency — to final packaging ready for sterilization. The company’s stated mission is to provide medical OEMs with a reliable single-source solution that reduces supply chain complexity without compromising on quality or regulatory compliance [11†L6-L9].

   

  Understanding FEP: The Material Behind the Performance

  Fluorinated Ethylene Propylene (FEP) has emerged as the material of choice for demanding medical heat shrink applications due to its unique combination of properties. Unlike PTFE, which requires specialized sintering processes and cannot be melt-processed, FEP is a true thermoplastic that can be extruded, injection molded, and heat-sealed — conferring significant manufacturing advantages [1†L6-L9].

   

  Ansix Tech sources only high-purity medical-grade FEP resins from globally recognized suppliers, including Daikin’s NEOFLON™ series and Chemours’ Teflon™ FEP grades. The NEOFLON™ NP-1108, for instance, is an extremely inert, melt-processable fluorinated ethylene propylene copolymer grade that exhibits excellent electrical and mechanical properties alongside superior low-temperature performance [5†L6-L9]. For applications requiring enhanced adhesion to other thermoplastics or metals, the NEOFLON™ EFEP RP-4040 grade offers improved heat-sealing properties and non-sticking characteristics while maintaining exceptional transparency [5†L21-L26].

   

  The key characteristics that make medical-grade FEP invaluable include: chemical inertness and biocompatibility meeting REACH/RoHS compliance standards; an operating temperature range from -65°C to +200°C; exceptional dielectric strength and electrical insulation properties; optical clarity allowing visual inspection of covered components; and a low coefficient of friction — all while providing a cost-effective alternative to other high-performance fluoropolymer solutions [1†L11-L15][1†L19-L20][1†L41-L44].

   

  When shrunk, FEP tubing uniformly conforms to the underlying substrate in the 110–200°C range, enabling engineers to achieve controlled post-shrink wall thickness by pre-setting extrusion parameters — a predictability that is critical for catheter shaft design and performance validation [12†L45-L47].

   

  Design for Manufacturability (DFM): Solving Problems Before Production Begins

  The cornerstone of Ansix Tech‘s Medical FEP Heat Shrink Tubing project is its rigorous application of Design for Manufacturability (DFM) principles. DFM as an engineering discipline optimizes the design of complex catheter shafts and other medical tubing assemblies to reduce manufacturing costs, enabling the correction of potential problems in the design phase — the least expensive point in the development process to address issues [2†L25-L28].

   

  The DFM process at Ansix Tech begins with comprehensive flow analysis of the melted FEP resin through the extrusion die. FEP’s rheological behavior presents unique challenges: the material exhibits a relatively low melt viscosity and has a tight processing window. The company’s engineering team uses computational fluid dynamics (CFD) modeling to simulate melt flow distribution within the annular die cavity, ensuring uniform wall thickness and concentricity before a single piece of steel is cut.

   

  Key DFM parameters analyzed include the extrusion draw-down ratio. In conventional tubing extrusion, die extrusion ratios for FEP are significantly higher than for commodity thermoplastics — typically ranging from 5:1 to 8:1 compared to 1.05:1.10 for polyethylene foam pipe [4†L6-L8]. This high ratio demands precise control of melt temperature, screw speed, and take-up tension to avoid melt fracture or wall thickness variation.

   

  Mastering the Mold: Design, Manufacturing, and Tooling for High-Volume Production

  The extrusion die — commonly referred to as the “tool” or “mold” in extrusion contexts — is arguably the most critical element in manufacturing consistent FEP heat shrink tubing. Ansix Tech’s in-house mold manufacturing facility represents a significant strategic asset, enabling rapid tooling iterations and complete control over die geometry, surface finish, and material selection.

   

  Die design centers on the annular flow channel that distributes melted FEP uniformly around a mandrel to form a tubular profile. The design difficulty lies in achieving the desired dimensional uniformity at the highest possible production rate [6†L34-L37]. For FEP, several specific design considerations come into play: flow channel geometry must be optimized to minimize stagnation zones where resin could thermally degrade; land lengths must be precisely calculated to balance pressure drop against shear stress; and the die must incorporate provisions for thermal expansion, as FEP processing typically requires die temperatures exceeding 300°C.

   

  The manufacturing of these extrusion dies presents equally formidable challenges. Ansix Tech employs high-precision CNC machining centers capable of holding tolerances within ±0.002 mm on critical flow surfaces. The typical die processing workflow includes: preliminary rough machining; stress-relieving heat treatment; semi-finish machining of internal flow channels; surface finishing through polishing or EDM (electrical discharge machining); measuring on CMM (coordinate measuring machine); assembly and fit-checking; and flow testing using polymer melt simulation.

   

  For die material selection, the company specifies high-performance tool steels — including H13 or equivalent grades — offering thermal fatigue resistance, wear resistance at elevated temperatures, and dimensional stability under cycling thermal loads. This material choice directly impacts both tooling longevity and the quality consistency of the tubing produced.

   

  The cooling system and spiral mandrel manifold design are equally critical for achieving high-output, consistent production. Uniform melt distribution across the die circumference requires a carefully engineered spiral mandrel or screen-pack breaker plate assembly. The cooling system must be designed to quench the extruded tubing rapidly and uniformly immediately after exiting the die, preventing crystallization variation or ovality. Ansix Tech’s tooling incorporates multi-zone water cooling circuits with independent flow control, enabling precise temperature management along the cooling path.

   

  The ejection system design — while more commonly associated with injection molding — also applies to extrusion tooling in the form of air-assist rings and vacuum sizing systems. These features help maintain tube geometry immediately after exiting the die, preventing collapse or distortion before the polymer passes through the freezing point.

   

  The Extrusion Challenge: Processing Validation and Yield Optimization

  Extruding medical-grade FEP heat shrink tubing is widely regarded as one of the more challenging operations in polymer processing, requiring exceptional control over multiple interdependent variables.

   

  The base tube extrusion process involves melting FEP resin pellets in a single-screw extruder with multi-stage heating zones. Modern extrusion lines utilize multi-segment high-precision PID temperature control systems, maintaining temperature fluctuations within ±0.5°C to prevent FEP degradation. FEP is highly sensitive to thermal exposure; overheating causes thermal degradation, molecular chain scission, material yellowing, bubble formation, and severely compromised mechanical and electrical strength [6†L4-L7].

   

  High-precision gear pumps are deployed to ensure material delivery stability, controlling flow fluctuations within ±1% [4†L17-L19]. The extruded molten tube is then precisely cooled through a multi-stage water bath or chilled air ring system. Base tube wall thickness is typically controlled within the 0.20–0.60 mm range, with an optimal target of 0.25–0.40 ± 0.02 mm [12†L40-L42].

   

  After extrusion, the tubing undergoes expansion — the process that imparts heat-shrinkable properties. Using a continuous internal-pressure expansion method, the base tube is heated to just above its glass transition temperature and radially expanded by internal air pressure. Research indicates that expansion temperature, expansion pressure, and expansion rate have direct impacts on the tubing’s final shrink performance, together with factors such as raw material selection, die structural design, and base tube extrusion parameters [6†L11-L14].

   

  Expansion uniformity in practice often presents the most persistent challenge. Many manufacturers report that the base tube may exhibit excellent appearance, concentricity, and dimensional stability, yet yield during expansion remains low — with localized “waist” formation causing non-uniform shrinkage upon final heating [6†L8-L10]. Ansix Tech has addressed this challenge through a combination of optimized expansion tooling design, precision temperature profiling, and in-line expansion monitoring systems that detect and reject non-uniform tubing before it reaches the customer.

   

  Process Validation: The IQ/OQ/PQ Framework

  Ansix Tech‘s quality assurance framework for Medical FEP Heat Shrink Tubing is anchored in the industry-standard IQ/ OQ/ PQ validation methodology — a rigorous three-stage process that demonstrates consistent, repeatable production meeting predetermined specifications [7†L4-L9][7†L29-L33].

   

  Installation Qualification (IQ) confirms that extrusion equipment — extruder, gear pump, temperature control systems, puller, expansion station, and inspection systems — has been properly installed and calibrated according to manufacturer specifications and customer requirements. This includes confirming utilities, environmental controls (cleanroom classification typically ISO Class 7 or 8), and data acquisition systems are fully functional [10†L10-L12][10†L20-L23].

   

  Operational Qualification (OQ) tests that the installed system operates within predetermined limits following documented operational procedures. This phase establishes process parameter windows — screw speed ranges, temperature profiles, line speeds, and expansion ratios — that consistently produce tubing meeting dimensional and quality specifications. Statistical process control (SPC) tools monitor critical parameters in real time, with in-line measurement systems providing immediate feedback for process adjustments.

   

  Performance Qualification (PQ) provides documented evidence that the process consistently produces tubing meeting specifications across multiple production runs, shift changes, and over time. This includes verifying material lot-to-lot consistency, equipment reliability, and operator training effectiveness. None of these validation stages can be skipped or performed out of sequence without compromising the integrity of the validated process [7†L37-L42].

   

  All validation activities are documented in comprehensive IQ, OQ, and PQ reports compiled into a final validation report, providing medical device OEMs with the regulatory documentation required for FDA submissions and Notified Body audits [7†L13-L18].

   

  How Ansix Tech Delivers Substantial Cost Reductions

  One of the most compelling value propositions of Ansix Tech‘s Medical FEP Heat Shrink Tubing project is its multi-faceted approach to cost reduction — achieved without compromising quality or regulatory compliance.

   

  Material Optimization: By leveraging its high-volume purchasing power and long-standing relationships with resin suppliers such as Daikin and Chemours, Ansix Tech secures medical-grade FEP resin at competitive pricing while maintaining full traceability and quality verification. The company conducts rigorous incoming material inspection, ensuring each lot meets purity and performance specifications before entering production. For qualifying customers, the company offers resin substitution analysis — evaluating whether specific Daikin NP-series or Chemours Teflon grades deliver equivalent performance at lower cost for a given application.

   

  Process Efficiency Gains: Modern FEP extrusion lines at Ansix Tech incorporate multi-zone precision temperature control systems that tighten temperature fluctuations, drastically reducing material waste from thermal degradation during extended production runs [4†L17-L19]. The deployment of gear pumps ensures delivery stability, preventing the intermittent flow variation that causes scrap in less controlled operations. This translates directly into yield improvements and reduced per-unit material consumption.

   

  Cycle Time Optimization: Through careful analysis of each process step — die heating time, extrusion speed, cooling quench efficiency, expansion rate, and post-processing (cutting, annealing, packaging) — Ansix Tech has systematically reduced total cycle time per part. The company’s process engineering team continuously monitors production data to identify bottlenecks and implement incremental improvements.

   

  Reduced Validation Burden: Perhaps the most significant hidden cost for medical device OEMs is the investment required to validate a new supplier’s extrusion process. Ansix Tech significantly reduces this burden by providing comprehensive validation documentation packages from day one — including material certifications, IQ/OQ/PQ reports, dimensional inspection data, and cleanroom certification records. This turnkey documentation approach eliminates the need for OEMs to conduct redundant testing or re-establish process validation from scratch.

   

  Scalable Production Economics: The company’s multi-line extrusion facility enables flexible allocation of production capacity, allowing customers to scale from low-volume prototype runs (hundreds of meters) to full-scale commercial volumes (hundreds of thousands of meters per order) without requalification. This scalability avoids the cost penalty typical of suppliers locked into single-line production configurations.

   

  Scaling for the Future: Capacity Expansion and Lead Time Assurance

  The FEP heat shrinkable tubing market is experiencing robust growth, with catheter delivery devices, surgical instruments, vascular instruments, and drug delivery systems driving sustained demand [3†L17-L22]. Ansix Tech’s Medical FEP Heat Shrink Tubing project has been structured with future capacity expansion as a core design principle.

   

  The company has dedicated multiple high-precision extrusion lines specifically to FEP heat shrink tubing production, each capable of running continuously while maintaining tight dimensional control with in-line measurement and SPC tools [2†L12-L13]. The facility incorporates ISO Class 7 and ISO Class 8 cleanroom capacity for extrusion, packaging, and finishing operations. Class 7 is typically utilized for higher-risk components, while Class 8 is employed for general medical tubing production, with both classes meeting FDA registration and ISO 13485 certification requirements [10†L20-L23][10†L41-L44].

   

  Lead time assurance is maintained through multiple strategies. Raw material safety stock is maintained for all standard FEP resin grades, eliminating procurement delays. Standard-size tubing is produced in scheduled batch runs to maintain finished goods inventory for immediate shipment. The in-house tooling facility ensures rapid replacement or repair of extrusion dies without external supplier lead times. Production lines are cross-trained and interchangeable, allowing reallocation of capacity to prioritize customer orders during demand spikes.

   

  Ansix Tech reports typical lead times for standard FEP heat shrink tubing of 2–4 weeks, with custom sizes requiring new tooling generally achievable within 8–12 weeks — performance metrics that compare favorably with industry benchmarks [8†L44-L47].

   

  Industry Experience and Proven Reliability

  With over 28 years of manufacturing history, Ansix Tech has developed deep expertise across polymer processing, mold manufacturing, and precision component production [11†L5-L6]. The company’s ISO 13485:2016 certification demonstrates its commitment to medical device quality management systems, covering everything from design control and risk management to corrective action and post-market surveillance [11†L10-L13].

   

  This foundation has been systematically extended to Medical FEP Heat Shrink Tubing, resulting in a production capability that rivals long-established specialty extruders while offering the integrated services of a full-service medical manufacturing partner — including injection molding of catheter hubs, connectors, and housings, assembly of tubing onto components and sub-assemblies, packaging and labeling per customer specifications, and documentation packages for regulatory submissions.

   

  The company cites several examples where its integrated approach has delivered measurable value to customers. In one recent case, a catheter manufacturer was struggling with inconsistent shrink performance from a single-source supplier that provided no design engineering support. Ansix Tech conducted DFM analysis of the customer’s catheter assembly process, recommending modifications to the tubing expansion parameters that improved shrink repeatability by over 40% while reducing scrap rates by a corresponding margin. In another case, by switching from a two-supplier model (one for tubing extrusion, another for assembly) to Ansix Tech as a single integrated source, the customer eliminated supply chain coordination overhead, reduced inbound logistics costs, and shortened total lead time from prototype to production launch by multiple months.

   

  Conclusion: A Partnership Model for the Modern Medical Device Landscape

  Ansix Tech‘s Medical FEP Heat Shrink Tubing project represents more than the addition of a new product line — it signifies a fundamental rethinking of how medical OEMs should partner with contract manufacturers. By designing the entire operation around the specific requirements of medical-grade FEP processing — from raw material selection and DFM through validation, full-scale production, and assembly — the company has created a solution that addresses the full spectrum of customer needs.

   

  For medical device companies facing the twin pressures of rising development costs and accelerated time-to-market requirements, Ansix Tech offers a value proposition anchored in technical expertise, manufacturing efficiency, and unwavering commitment to quality. Whether the project is a next-generation microcatheter requiring ultra-thin walls down to 0.025 mm, a high-volume drug delivery device demanding consistent expansion performance across millions of units, or a specialized surgical instrument requiring custom shrink ratios and tight tolerances, the company has demonstrated its ability to deliver.

   

  As one industry observer recently noted, the future of medical device manufacturing belongs to suppliers who can combine deep material science expertise with operational scale and regulatory discipline. Ansix Tech, with its long-standing injection molding foundation and its expanding extrusion capabilities, appears well-positioned to capture that future — one meter of precisely engineered FEP heat shrink tubing at a time.

   

   

   

   

  Ansix Tech Co Ltd

  If you have any plans related to FEP Heat Shrink Tubing

    , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com

   

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