Expanded PTFE sheet (also called ePTFE sheet or soft PTFE sheet) is made from 100% virgin PTFE that has been biaxially oriented — stretched in both length and width directions to transform the dense solid PTFE into a soft, fibrous, micro-porous structure. The biaxial orientation gives the material significantly higher tensile strength than regular PTFE joint sealant tape, while retaining the universal chemical resistance, low friction coefficient and wide temperature range of the base material.
Unlike standard PTFE sheet that relies on high bolt load to seal, ePTFE sheet compresses under minimal bolt load and conforms to irregular, pitted or damaged flange surfaces where hard gaskets would leak. Its resistance to cold flow, creep relaxation and pressing ensures reliable long-term sealing performance across thermal cycling — making it the preferred material for glass-lined reactors, plastic flanges, and large-diameter or complex flange geometries.
Why biaxially oriented ePTFE outperforms conventional PTFE sheet in soft-sealing applications
| Property | Expanded PTFE Sheet | Standard PTFE Sheet | Filled PTFE Sheet |
|---|---|---|---|
| Structure | Biaxially oriented, fibrous | Dense, solid | Dense, solid + fillers |
| Compressibility | 55% | 15% | 10% |
| Bolt Load Required | Low | High | High |
| Creep Relaxation | Minimal | High | Moderate |
| Irregular Surfaces | Excellent | Poor | Poor |
| Best For | Fragile / glass-lined / irregular flanges | Dense precision gaskets | High-pressure, anti-creep |
Engineered for soft-sealing service where conventional PTFE sheet fails
Lowest coefficient of friction of any solid material — easy to install and clean.
Universal pH 0-14 resistance — inert to nearly all corrosive media.
Biaxial orientation gives higher tensile strength than PTFE joint sealant tape.
Excellent resistance to cold flow and creep relaxation under sustained bolt load.
Continuous service up to 260°C, peak temperature 310°C.
100% virgin PTFE suitable for food, beverage and pharmaceutical service.
Wherever conventional PTFE sheet cannot seal effectively
Low bolt load keeps glass intact
Prevents cracking under bolt torque
Cut in-house from stock sheet
Pitted, scratched, corroded surfaces
FDA-compliant hygienic sealing
Universal pH 0-14 resistance
Complete ePTFE product family from Kaxite Sealing
Standard PTFE sheet is dense and solid, requiring high bolt load to seal and tending to cold-flow under sustained pressure. Expanded PTFE sheet is biaxially oriented into a soft fibrous structure with 55% compressibility — it conforms to irregular surfaces and seals at very low bolt load, with minimal creep relaxation. See our product page for full specifications.
Standard sheet size is 1500 × 1500 mm. Thickness range is 0.5 mm to 6 mm. Custom sizes and thicknesses are available on request with no extra tooling charge for standard materials. Please send your inquiry with your requirement for a fast quotation.
Yes. Our expanded PTFE sheet is manufactured from 100% virgin PTFE and complies with FDA 21 CFR 177.1550 for food contact. It is also RoHS and REACH compliant. See our Our Certificate page for documentation.
Absolutely. Expanded PTFE sheet is designed for in-house cutting with simple tools — scissors, die cutters or a CNC knife table. We can also supply gaskets pre-cut to your drawing. See Expanded PTFE Gasket for the finished product range.
Yes. Every shipment includes Mill Test Certificate and dimensional inspection record. Third-party inspection (SGS, BV, TUV) is available on request. Contact us via Contact Us to discuss documentation requirements.
MOQ is 10 sheets for standard sizes. Lead time is 7-15 days after order confirmation. Payment terms are T/T or L/C. Free samples are available — you only cover the courier cost. Send your inquiry for a fast quotation.
Expanded PTFE Sheet is made from 100% virgin PTFE with biaxially oriented,and more strength than ptfe joint sealant. it is white color，peak temperature 310℃，In possession of the characteristics of self-lubrication, low coefficient of friction and widely chemical corrosion resistance with good resistance of pressing, cold flow,and creep relaxation.
