Polytetrafluoroethylene (PTFE) liner tubes play a pivotal role in high-end vascular interventional catheters (such as microcatheters, balloon catheters, and guiding catheters) due to their exceptional lubricity, chemical inertness, and biocompatibility. With their low friction coefficient, antithrombotic properties, and flexibility, they have become the ideal material for enhancing surgical safety and operational precision.

PTFE liner tubes break through strength and dimensional limits with ultra-thin wall designs, serving as the core “internal strength” of high-end vascular interventional catheters. Mochitek has achieved 0.0005-inch free extrusion technology, with etching effects rivaling international standards. We provide comprehensive solutions spanning from cardiovascular applications to high-pressure angiography, making the pinnacle of medical device performance within reach.

The etching of PTFE (polytetrafluoroethylene) is fundamentally a process of selective surface defluorination and chemical reconstruction. When PTFE material comes into contact with a sodium-based etching solution, the reactive sodium ions preferentially attack the carbon-fluorine bonds (C-F) in the polymer chains. Through electron transfer reactions, fluorine atoms are stripped from the polymer backbone while generating unstable carbon radical intermediates on the surface. This process creates active carbon sites with unpaired electrons within the outermost 2-5 nanometer layer of the material. When exposed to ambient air, these active sites rapidly react with oxygen and water molecules through oxidation processes, forming oxygen-containing polar functional groups such as carboxyl (-COOH) and hydroxyl (-OH) groups.

This surface chemical modification not only alters the material’s wettability characteristics (reducing the contact angle from 110° to 60-80°) but more importantly constructs a chemically active transition layer while preserving PTFE’s excellent bulk properties. The transition layer achieves enhanced interfacial bonding strength (up to 50 times greater than untreated material) through two mechanisms: chemical bonding via newly introduced polar groups with adhesives, and mechanical interlocking through nano-scale surface roughness (Ra ≈ 0.1-1μm) created by etching.

The entire process is precisely controlled to remain within the surface layer, achieving ideal surface activation while ensuring the bulk material’s mechanical properties and biocompatibility remain unaffected. This elegantly solves the adhesion challenges caused by fluoropolymer’s inherently low surface energy.

Mochitek’s 0.0005-inch wall-thickness PTFE liner tubes demonstrate etching effects and mechanical performance on par with international brands. Beyond this, we offer complete solutions including mandrel extrusion and dip-coated liner tubes. Our delivery times and pricing are also more competitive compared to industry peers.

If you have any questions or needs regarding our PTFE Liner, please feel free to contact us. Our contact information is as follows:

Phone: +86 15956561251
Email: ruby@mochi.org.cn

Looking forward to working with you to create a bright future!