For applications involving uneven flanges, fragile sealing surfaces, extreme temperatures, or aggressive chemicals, expanded PTFE sheet provides a versatile sealing solution that combines adaptability, durability, and chemical resistance in a single material.
Unlike rigid PTFE materials, the expanded structure provides excellent flexibility and compressibility, allowing the sheet to adapt to rough, scratched, pitted, and uneven flange surfaces.
If you are looking for ePTFE products manufacturer and supplier, Taifno is a good choice, we will reply to your inquiry within 24 hours.
Expanded PTFE Sheet is manufactured from 100% virgin PTFE resin through a specialized expansion process that transforms the dense PTFE structure into a flexible micro-fibril network. This unique multidirectional fiber structure combines softness and compressibility with the chemical stability and durability of PTFE.
The expanded fiber network allows the material to adapt naturally to flange surface imperfections. Under low bolt pressure, the soft structure fills scratches, pits, and uneven areas to create a reliable sealing barrier.
After compression, the material maintains excellent recovery performance, helping prevent leakage caused by pressure changes, temperature cycling, and long-term service conditions.
1. Pure PTFE Composition: Made from 100% virgin PTFE without fillers or binders, ensuring excellent chemical compatibility and preventing contamination risks.
2. Superior Surface Adaptability: The soft and flexible structure conforms to irregular flange surfaces, making it suitable for fragile equipment and low-torque sealing applications.
3. Reliable Long-Term Sealing: The expanded structure reduces creep and cold flow, helping maintain sealing performance over extended operation.
4. Easy Installation: Self-adhesive backing options are available to improve positioning stability during installation, especially on vertical or overhead flange surfaces.
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Problem |
How ePTFE Sheets Solve It |
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Standard PTFE creeps and leaks |
Micro-porous structure resists cold flow — maintains seal over time |
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Rough, pitted flanges leak |
Soft material fills irregularities — seals without high torque |
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Glass-lined flanges crack under high torque |
Seals with low bolt pressure — protects fragile surfaces |
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Conventional gaskets require multiple sizes |
One sheet — cut to any shape, any size, on-site |
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Standard gasket material fails in chemicals |
100% pure PTFE — pH 0-14 universal resistance |
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Installation requires skilled labor |
Easy to cut, easy to install, self-adhesive available — simple and fast |
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Feature |
ePTFE Sheet |
Conventional PTFE Sheet |
Why It Matters |
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Conformability |
★★★★★ fills scratches and pits |
★☆☆☆☆ rigid |
Seals on damaged flanges without grinding or machining |
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Creep Resistance |
✅ No cold flow |
❌ Creeps under load |
No bolt re-torquing. No leaks over time |
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Sealing on Rough Flanges |
✅ Excellent |
❌ Poor — requires perfect flanges |
Works on flanges that would leak with standard PTFE |
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Total Cost (3-year) |
Lowest — one sheet replaces many sizes |
Moderate |
Less inventory, less waste, less downtime |
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If Your Application Is... |
Choose... |
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Damaged, scratched, or warped flanges |
ePTFE Sheet — fills irregularities, low torque |
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Glass-lined, ceramic, or plastic flanges |
ePTFE Sheet — low bolt pressure, conformable, safe |
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Large-diameter flanges or odd shapes |
ePTFE Sheet — cut to fit any shape on-site |
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High-temperature cycling (+200°C to +315°C) |
ePTFE Sheet — maintains seal, no creep |
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Chemical, pharmaceutical, or food processing |
ePTFE Sheet — pure PTFE, FDA-compliant |
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Clean, smooth flanges, standard sizes, low cost |
Conventional PTFE sheet |
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Industry |
Application |
Key Requirement |
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Chemical Processing |
Pipe flanges, reactor covers, heat exchangers — acids, solvents |
Universal chemical resistance, low torque, rough flanges |
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Pharmaceutical |
Sterile equipment, bioreactors — FDA compliance |
Pure PTFE, non-contaminating, FDA 21 CFR 177.1550 |
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Food & Beverage |
Sanitary connections, filling equipment — FDA compliance |
Pure ePTFE, easy cleaning, no contamination |
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Pulp & Paper |
Large diameter flanges, digesters — thermal cycling |
Conformability, temperature cycling |
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Power Generation |
Steam systems, condenser flanges — high temperature |
Wide temperature range, creep resistance |
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Glass-lined Equipment |
Glass-lined reactors, vessels — fragile surfaces |
Low bolt pressure, conformability, no glass damage |
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Cryogenic Service |
LNG, liquid oxygen — extreme cold |
Non-brittle at cryogenic temperatures |
Client: A chemical plant handling acids and solvents (fortune 500 chemical company)
Challenge: Conventional PTFE gaskets on heat exchanger flanges were replaced every 6 months due to creep deformation and leakage. High temperatures and pressure cycling caused cold flow, bolt torque loss, and leakage. Maintenance cost: $5,000 per flange per year.
Solution: Replaced with expanded PTFE sheet, custom cut to gasket shape. The soft, conformable material filled flange irregularities. Low bolt torque required.
Result: Zero leakage for 18 months. No bolt re-torquing required. Creep eliminated. Estimated cost savings: $7,500/year per flange.
Client: A pharmaceutical manufacturer with multiple glass-lined reactors
Challenge: Glass-lined reactor covers were cracking due to high torque required to seal rigid PTFE gaskets. Each glass repair cost $8,000 plus production downtime.
Solution: Installed expanded PTFE sheet with self-adhesive backing. Cut to fit reactor manway flange. Low bolt pressure required, eliminated stress on the glass lining.
Result: Zero glass damage. Perfect seal with lower torque. Installation time reduced by 80%. No replacements in 18 months. Saved $16,000 in glass repair costs.
Note: Actual case results vary by application conditions. Contact us for application-specific recommendations.
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Parameter |
Value |
|
Temperature Range — Continuous |
-196°C to +200°C |
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Temperature Range — Short-Term |
Up to +315°C |
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Pressure — Max |
20 MPa |
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pH Range |
0-14 — universal chemical resistance |
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Density |
0.7-1.0 g/cm³ |
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Compressibility |
45% ± 5% (ASTM F36) |
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Recovery |
≥10% (ASTM F36) |
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Tensile Strength |
≥10 MPa |
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Material |
100% Virgin PTFE (expanded) |
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FDA Compliant |
Yes — meets FDA 21 CFR 177.1550 |
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Color |
White/off-white |
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Size (mm) |
Thickness Range (mm) |
|
1500 × 1500 |
0.5 — 6 |
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1500 × 4500 |
0.5 — 6 |
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1800 × 5400 |
0.5 — 6 |
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2000 × 2000 |
0.5 — 6 |
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Custom sizes available on request |
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100% Virgin PTFE Resin — no regrind, no recycled material. Consistent quality, batch after batch.
Full Traceability — Every batch traceable from raw material to finished sheet. Material certificates on request.
FDA-Compliant Grade — Meets FDA 21 CFR 177.1550 for food and pharmaceutical applications.
Tested to International Standards — ASTM F36 (compressibility/recovery), ASTM F152 (tensile strength), ASTM D792 (density).
Long Shelf Life — Unlimited shelf life — no degradation over time.
Self-Adhesive Option — Available with pressure-sensitive adhesive backing for easy vertical installation.
A: The ePTFE sheet is a soft, conformable sealing sheet made from 100% expanded PTFE. Cut to size on-site and press onto flange face. Seals on rough, pitted, or warped flanges with low bolt torque, where conventional PTFE leaks. One sheet replaces many gasket materials.
When to use it: Damaged flanges, glass-lined flanges, large diameter flanges, low torque applications, thermal cycling, and chemical service.
When NOT to use it: High pressure dynamic sealing (moving parts), static seal only.
A: Cost depends on thickness, size, quantity, and whether self-adhesive backing is required.
Comparison: One ePTFE sheet typically costs about the same as stocking 8-10 different cut gasket sizes. But one sheet covers 80%+ of your flange sizes, you cut what you need, zero waste, zero waiting. Over a year, customers typically save 40-60% on total gasket costs vs. stocking multiple sizes.
Lead time:
In stock: ships within 24-48 hours.
Shipping: air 5-10 days, sea 15-30 days.
Send us your size and application, we quote within 24 hours.
A: Temperature: -196°C to +200°C (short-term).
Pressure: up to 20 MPa.
Chemical: pH 0-14, universal resistance, except molten alkali metals and elemental fluorine.
Three common mistakes:
(1) Using wrong thickness: for rough surfaces, use thicker sheet or double-up; for smooth flanges, standard thickness works.
(2) Over-tightening: ePTFE seals with low torque; over-tightening can damage the sheet and cause leaks.
(3) Not supporting the sheet during installation: self-adhesive backing holds it in position; without it, the sheet may shift.
Self-adhesive tip: For vertical or overhead flanges, use self-adhesive backed sheet, peel the backing film, press firmly onto the flange surface, and it stays in position during assembly.
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