Microstructured Soft-Sealing Fluoropolymer

Expanded PTFE (ePTFE)

Expanded PTFE (ePTFE) is a soft, highly conformable form of polytetrafluoroethylene with a unique microstructure that allows it to seal on irregular, damaged, or fragile flanges with minimal bolt load. We stock ePTFE gasket sheet from leading manufacturers for glass-lined, FRP, and other low-bolt-load sealing applications.

At a Glance

Temperature Range

-200 °C to +260 °C continuous

Thickness Range

1.5 mm to 6 mm

Brands We Stock

Gore GRSealcom 500SoftchemDoniflon 900EGaskotex
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Technical Properties

Typical values across stocked grades. Specific grade data sheets available on request.

Temperature Range-200 °C to +260 °C continuous
Pressure RangeUp to ~80 bar at 260 °C subject to PxT envelope ≤7,000 bar·°C (per Gore GR; lower for general grades)
Minimum Seating Stress5–10 MPa typical for low-pressure service (manufacturer-specific; see datasheet)
Compressibility (ASTM F36)50–65% @ 17.2 MPa (F36 standard pressure for PTFE)
Recovery (ASTM F36)5–15% (low-recovery by design — node-and-fibril structure compresses irreversibly)
Tensile Strength (ASTM D638)5–20 MPa (direction dependent)
Specific Gravity0.6–1.1 g/cm³ (varies with density grade)
Sealability (EN 13555:2021)Leak class L0.01 achievable at typical service stresses
Thickness Range1.5–6.0 mm stocked
MicrostructureBiaxially expanded node-and-fibril PTFE
Chemical ResistanceNear-universal. Same as virgin PTFE
Key AdvantageSeals on damaged, rough, or fragile flanges with minimal bolt load

Common Applications

  • Glass-lined reactor and vessel flange gaskets
  • FRP (fibreglass reinforced plastic) flange seals
  • Fragile or warped flange faces
  • Low bolt-load flanges where gasket stress is limited
  • Chemical processing — aggressive acids, solvents, and oxidisers
  • Pharmaceutical and high-purity process seals
  • Large-diameter flanges with uneven surfaces
  • Enamel-coated equipment gaskets
  • Heat exchanger cover gaskets on thin tube sheets
  • Multi-media service where a single gasket material is preferred

Available Grades

Brands we stock: Gore GR, Sealcom 500, Softchem, Doniflon 900E, Gaskotex

Standard ePTFE Gasket Sheet

General-purpose expanded PTFE sheet with excellent conformability and near-universal chemical resistance. Our standard grade for glass-lined, FRP, and low-bolt-load sealing applications.

ePTFE with Adhesive Backing

Expanded PTFE sheet with a pressure-sensitive adhesive on one face for easy positioning on vertical or overhead flanges during installation. The adhesive burns off cleanly during service.

ePTFE Tape / Joint Sealant

Narrow-width expanded PTFE tape for form-in-place gasket making on irregular bolt patterns, non-standard flanges, and large-diameter equipment. Cut to length and pressed into any shape on site.

Related Resources

Chemical Compatibility

Check ePTFE compatibility with your process media.

Gasket Selection Guide

Find the right gasket type for your application.

Related Materials

Virgin PTFE Filled PTFE

Need Expanded PTFE (ePTFE)?

We supply expanded ptfe (eptfe) in sheet, roll, and custom die-cut forms. Contact our team for pricing, data sheets, or technical assistance.

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Disclaimer

This resource is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.