Kaxite pure PTFE gaskets are precision cut or molded from 100% virgin polytetrafluoroethylene without fillers or additives. The result is a chemically inert, non-contaminating sealing element that performs reliably across pH 0–14 and a service range of −212 °C to +260 °C. Supplied as flat ring, full-face flange, V-shape and valve-annulus gaskets, they are the default specification for aggressive chemical, pharmaceutical and food-grade piping where the gasket itself must not react with, leach into, or contaminate the process media.
As a direct PTFE gasket manufacturer in Ningbo, China, we supply custom dimensions in thicknesses from 0.5 mm to 10 mm, in compliance with ASME B16.5, EN 1092-1, DIN, JIS and GB flange standards. OEM/ODM, bulk wholesale and free samples for qualified buyers.
Unlike filled PTFE, expanded PTFE or spiral-wound constructions, a pure PTFE gasket contains nothing but virgin resin. That single-material construction removes the risk of filler leaching, galvanic corrosion and differential thermal expansion between components — problems that shorten service life on aggressive or high-purity lines.
Reactor, heat exchanger, storage tank and transfer-line flanges handling aggressive acids, bases and solvents.
Sterile process equipment, CIP/SIP circuits and high-purity lines where FDA-compliant, non-leaching sealing is mandatory.
Dairy, brewing, edible-oil and ultra-pure water piping needing inert, odourless and taste-neutral gaskets.
Refining units, chemical injection skids and aggressive-media flanged joints up to moderate pressure ratings.
Ultra-clean fluid and gas transfer where metallic contamination and particulate release must be avoided.
Chlorination, dosing and demineralisation lines where chemical inertness and long service life are required.
| Property | ASTM test | Value |
|---|---|---|
| Specific gravity | D792 | 2.10 – 2.30 |
| Water absorption (%) | D570 / 24 hrs | < 0.01 |
| Contact angle (degree) | Angle to level | 110 |
| Porosity | — | Non-porous |
| Colour | — | Natural white |
| Property | ASTM test | Value |
|---|---|---|
| Melting point (°C) | — | 327 |
| Maximum continuous service temperature (°C / °F) | — | 260 / 500 |
| Minimum service temperature (°C / °F) | — | −212 / −350 |
| Short-term peak temperature (°C) | — | 316 |
| Thermal conductivity (cal/sec/cm², °C/cm) | C177 | 6 × 10⁻⁴ |
| Coefficient of linear thermal expansion (1/°C) | D696 / 23–60 °C | 10 × 10⁻⁵ |
| Property | ASTM test | Value |
|---|---|---|
| Tensile strength (MPa) | D638 / 23 °C | ≥ 15.0 |
| Ultimate elongation (%) | D638 / 23 °C | ≥ 150 |
| Compression strength (MPa) | D695 / 1% deformation, 25 °C | 10 – 12 |
| Flexural modulus (MPa) | D790 / 23 °C | 500 – 600 |
| Hardness (Shore D) | Durometer | D50 – D65 |
| Deformation under load (%) | D621 / 100 °C, 70 kgf/cm², 24 hrs | ≤ 15 |
| Static friction coefficient | Coated steel surface | 0.02 – 0.04 |
| Compressibility / recovery | ASTM F36 | On request |
| Property | ASTM test | Value |
|---|---|---|
| Chemical resistance | — | pH 0 – 14 |
| Dielectric constant | D150 / 10³ Hz | 2.1 |
| Dielectric breakdown strength (V/mil) | D149 / short time | 480 |
| Volume resistivity (Ω·cm) | D257 | > 10¹⁸ |
| Weather ability | — | Excellent |
| Combustibility (oxygen index, %) | D2863 | > 95 |
| Certifications | — | FDA 21 CFR 177.1550 / RoHS / REACH |
Standard thicknesses are 0.5, 1, 1.5, 2, 3, 5, 8 and 10 mm. Other thicknesses and outside/inside diameters can be produced on request. Contact us with your flange standard (ASME B16.5, EN 1092-1, DIN, JIS, GB) and nominal size for a matched drawing.
To quote accurately, please provide the following information with your inquiry:
Send flange standard, size and thickness — our engineers reply with pricing, lead time and sample availability within 24 hours.
Related products: Expanded PTFE Gaskets PTFE Envelope Gaskets Modified PTFE Gaskets PTFE Ring Gaskets PTFE Sheets
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
