GYLON® Style 3540

Microcellular PTFE Gasketing for Glass-lined Equipment

The GYLON® Style 3540 gasket is a highly compressible, microcelluar PTFE gasketing material designed to compress and conform to irregular or damaged surfaces, making it suitable for flanges that generate lower compressive stresses, such lined flanges and equipment.



Features & Benefits

  • Tight seal
  • Highly compressible PTFE seals under low bolt load
  • Compressible material conforms to surface irregularities, especially on warped, pitted, or scratched flanges
  • Reduced cold flow and creep
  • Pure PTFE withstands a wide range of chemicals
  • Soft PTFE can be cut easily from larger sheets, reducing inventory costs and expensive downtime
  • Will not support flame
  • Will not support bacterial growth


  • Available in sheet or cut gasket form
  • Color: White
  • Microcellular PTFE
  • Meets FDA specifications
  • Min. Temperature: -450°F / -268°C
  • Max. Temperature: 500°F / 260°C
  • Max. Pressure: 1200 PSI / 55 bar
  • Maximum PxT 1/16: 350,000 °F x PSIG / 12,000 bar x °C
  • Maximum PxT 1/8: 250,000 °F x PSIG / 8,600 bar x °C


  • Suitable for many non-metallic flanges*
  • Strong caustics
  • Strong acids
  • Hydrocarbons
  • Chlorine
  • Cryogenics
  • Glass-lined equipment

*For flat face flanges, a minimum compressive stress of 1,500 psi is recommended on the contacted gasket area for 150 psig liquid service. Consult with Khong Lieng to confirm that adequate compressive stress is available.

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