PFX Flex™ Sub-Lite-Wall™

Engineered as a PFAS-free1 alternative to film-cast PTFE, PFX Flex™ Sub-Lite-Wall™ is a next-gen catheter liner that delivers proven lubricity, enhanced bond strength, and expanded sterilization options.

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Certified PFAS-Free Performance1,2

PFX Flex™ Sub-Lite-Wall™ helps medical device manufacturers transition beyond fluoropolymers without compromising the performance characteristics that matter most.2 Independently certified PFAS-free by Intertek,1 it gives manufacturers greater flexibility to design, build, and validate next-generation devices.

PTFE-Like Lubricity2

Delivers PTFE-like lubricity without PFAS for smooth device tracking and clinician-trusted performance.

Direct Covalent Bond2

Bonds directly to thermoplastics—no etching required—and provides film-cast–level strength after reflow.

Sterilization Beyond EtO2

Engineered for compatibility with gamma and e-beam sterilization—expanding flexibility in device manufacturing.

PTFE-Like Flexibility2

Matches the flexibility of film-cast PTFE for improved trackability and steerability in complex and tortuous pathways.

High Abrasion Resistance2

Engineered to resist scratching and flaking, reducing particulate generation for cleaner, more reliable performance.

Film-Cast Performance up to 0.387″ ID

IDs from 0.013″ – 0.387″ (0.330 mm – 9.830 mm) expand design freedom across multiple catheter platforms and can serve as an alternative to film-cast liners.

PFXTM Platform

More than a Material Breakthrough, PFX is a Strategic Advantage

The PFXTM platform brings together a portfolio of non-fluorinated polymer solutions, delivering the trusted performance you depend on with additional sustainability and compliance advantages. The result: greater design freedom, fewer manufacturing constraints, and performance continuity across your value chain.

Lower Environmental and Regulatory Risk

The PFX platform helps reduce environmental impact and regulatory uncertainty, supporting product integrity, brand confidence, and broader sustainability goals.

Reliable Production. Future-Ready Supply.

Optimized for manufacturing excellence, PFX delivers consistent quality and a future-proof sourcing strategy without compromising performance.

Design Without Limits. Performance Without PFAS.1,2,3,4

Engineered for next-generation devices, PFX delivers exceptional design flexibility and versatility to meet the most demanding performance requirements – all without PFAS.

Certified PFAS-Free Catheter Liners1

As conversations around “PFAS-free” continue to evolve, Zeus has taken a deliberate, science-based approach grounded in transparency and material integrity to ensure customers can move forward with confidence, knowing our solutions are built on rigor, not assumptions.

PFX Flex liners are the first catheter liners in the industry to achieve PFAS-free certification from Intertek, one of the largest assurance, testing, inspection, and certification (ATIC) organizations in the world. Intertek’s PFAS-free certification confirms PFX Flex liners contain total organic fluorine levels of less than 20 ppm and targeted PFAS of less than 25 ppb.

PFAS-Free Liner1 for Additional Regulatory Confidence

PFX Flex is formulated without fluorinated polymers, offering a next-generation liner material designed to align with evolving global regulatory expectations while maintaining the performance and quality OEMs demand.

PTFE-Level Lubricity2 — Without PFAS1

PFX Flex delivers PTFE-like lubricity for smooth IDs, controlled movement, and reliable performance.

  • No additives or coatings required to achieve lubricity – performance is intrinsic to the material
  • Low coefficient of friction comparable to PTFE liners
  • Predictable handling for precise control through complex anatomy
  • Smooth, consistent IDs for reduced insertion resistance and reliable catheter advancement

Test Report

PFX Flex vs. PTFE Catheter Liners

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Simplifies Assembly with Direct Bonding2 for Greater Reliability

PFX Flex simplifies catheter assembly with a direct covalent bond to thermoplastics – no chemical etching and greater long-term reliability.

  • Direct covalent bond to thermoplastics for durable, delamination-resistant assemblies
  • Eliminates tie-layer adhesives, reducing process steps and material interfaces
  • Synergistic strength: Lamination process results in enhanced system strength as a result of covalent bond

Test Report

PFX Flex vs. PTFE Catheter Liners

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Sterilization Methods Beyond EtO2 for Greater Flexibility

PFX Flex offers sterilization flexibility beyond EtO, enabling alternative pathways to market that align with evolving operational and sustainability priorities.

  • Expands sterilization choices without compromising performance
  • Compatible with gamma and e-beam sterilization methods
  • Maintains performance after EtO sterilization, with stable mechanical and surface properties

Test Report

PFX Flex vs. PTFE Catheter Liners

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PTFE-Like Flexibility2 for Confident Navigation

PFX Flex Sub-Lite-Wall liners offer exceptional flexibility, outperforming traditional PTFE liners, allowing for smooth navigation and precise control through complex anatomies.

  • Improved trackability and steerability promote smooth, predictable navigation through complex anatomy
  • Maintains flexibility after reflow, supporting consistent performance across a wide range of end-use applications
  • Supports accurate, repeatable tip deflection for greater precision and control

Test Report

PFX Flex vs. PTFE Catheter Liners

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High Abrasion Resistance2 Reduces Particulate Risk

PFX Flex Sub-Lite-Wall liners offer high abrasion resistance, helping to minimize particulate generation in catheter assemblies.

  • Durable, abrasion-resistant construction that resists scratching, scuffing, and flaking
  • Particulate performance comparable to on-market catheters, with no particles detected above 50 µm.
  • Supports reliability in applications where particulate sensitivity is critical

Test Report

PFX Flex vs. PTFE Catheter Liners

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Film-Cast Capability up to 0.387″ ID— Expanding Design Possibilities

PFX Flex Sub-Lite-Wall liners can be produced with IDs from 0.013″ – 0.387″ (0.330 mm – 9.830 mm), expanding design flexibility across a wide range of catheter platforms.

  • Broad ID range: 0.013″ – 0.387″ (0.330 mm – 9.830 mm) – exceeding current industry offerings for film-cast PTFE by at least three times
  • Super-thin, uniform walls: 0.0015″ – 0.003″ (0.038 mm – 0.076 mm) with smooth internal surfaces and dimensional stability
  • Supports larger-bore and thin-wall configurations for therapies from neurovascular to structural heart

Coming Soon

PFX Product Roadmap

PFX Catheter Liner

PFX Max™

As the next liner in the PFX portfolio, PFX Max is designed to deliver greater strength, thinner walls, and tighter tolerances for advanced catheter applications where space or precision are critical – all without PFAS.3

PFX Heat Shrink

PFX Peelz™

PFX Peelz redefines heat-shrink performance for catheter manufacturing – a low-friction, reliable, easy-peel release without PFAS.4 Its composition supports improved process efficiency and higher waste-to-energy recovery.

PFX Polyimide

PFX Glide™

Developed as a next-generation alternative to polyimides with lubricious additives, PFX Glide is designed to deliver low friction, strong dielectric strength, and outstanding wear resistance, enhancing catheter deliverability and control.

Resources

Access quick links to all PFX Flex resources — including product datasheets, technical specifications, test reports, brochures, FAQs, and more — all in one place. 

Collateral

PFX Flex™ Sub-Lite-Wall™ Spec Sheet
Test Report: Comparing PFX Flex™ vs. PTFE Catheter Liners
Liners Comparison Brochure

PFAS Learning Center

Zeus Authored Articles

From Whisper to Wake-up Call: PFAS and the Future of Medical Devices
When Performance Meets Responsibility: Rethinking the Gold Standard in Medical Devices

Press & Media

PFX Flex Launch Press Release – January 2026

Still have questions?

If your question isn’t answered here or you’d like more detailed data, our technical and commercial teams are ready to help. 

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1 PFX Flex™ liners are made using a non-fluorinated polymer resin alternative to PTFE and without the intentional addition of any per- or polyfluoroalkyl substances (PFAS). Certified PFAS-free by Intertek Testing Services NA, Inc. to the following conformance criteria: (1) total organic fluorine not exceeding a concentration of 20 mg/kg; as determined with reference to ASTM D7359-23 and (2) targeted PFAS compounds not exceeding an individual concentration of 25 μg/kg as determined with reference to EN 17681-1:2025, EN 17681-2:2022-11, and/or CEN/TS 15968:2010. Current certification valid until June 21, 2027, subject to renewal and extension beyond such date.

2 Based on test report, Comparing PFX Flex™ vs. PTFE Catheter Liners. January 2026.

3 PFX™ liners are made using a non-fluorinated polymer resin alternative to PTFE and without the intentional addition of any per- or polyfluoroalkyl substances (PFAS). Independent third-party laboratory analysis on representative samples of PFX liners has confirmed total fluorine levels of less than 20 ppm in liner samples analyzed.

4 PFX™ heat shrink is made using a non-fluorinated polymer resin alternative to FEP and without the intentional addition of any per- or polyfluoroalkyl substances (PFAS). Independent third-party laboratory analysis on representative samples of PFX heat shrink has confirmed total fluorine levels of less than 20 ppm in heat shrink samples analyzed.