Garlock GYLON 3540 (White Sheet)

Garlock GYLON 3540 Microcellular PTFE.


A high performance gasket sheet of highly compressible microcellular PTFE that seals under low bolt loads. Suitable for many non-metallic flanges.
Garlock GYLON® gasketing is a family of flat PTFE gasketing materials. GYLON® high-performance PTFE gasketing is manufactured using a proprietary process that imparts unique physical properties, which are not obtainable through conventional manufacturing methods: Designed for severe chemical service, color-coded for easy identification, superior sealability, which helps reduce process and media loss as well as fugitive emissions, reduced creep and cold flow characteristics, and patented thermal bonding process to fabricate virtually any size gasket. The innovative GYLON® gasketing process reorients the PTFE and fillers in such a way to increase the material’s tensile properties and decrease the creep relaxation problems that usually plague PTFE products. In addition, the mixing process creates a homogenous material with consistent, superior physical properties that, unlike inexpensive skived PTFE sheet materials, do not fluctuate from one side of the sheet to another.


  • Tighter seal
  • Highly compressible PTFE seals under low bolt load- suitable for many non-metallic flanges*
  • Compressible material conforms to surface irregularities, especially on warped, pitted or scratched flanges
  • Reduced cold flow and creep normally associated with conventional PTFE gaskets
  • Excellent chemical compatibility – Pure PTFE withstands a wide range of chemicals
  • Easy to cut and install – Soft PTFE can be cut easily from larger sheets, reducing inventory costs and expensive downtime

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


Compatible With:

  • Strong caustics
  • Strong acids
  • Chlorine
  • Glass-lined equipment
  • Hydrocarbons
  • Cryogenics


Garlock GYLON 3540 Gasket Sheets are available in these sizes:

1/16”X 60”X 60”
1/8”X 60”X 60”

Note: Other thicknesses and sheet sizes may be available by special order.


Min. Temp-400°F
Max Temp500°F
Max Pressure1,200 PSI
Max PXT 1/16”350,000 (°F X PSIG)
Max PXT 1/8”250,000 (°F X PSIG)

ASTM F104 Line Call Out: