GYLON Style 3565 ENVELON™ Gasketing

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Reference GYLON Style 3565 ENVELON™ Gasketing
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PTFE Gasketing with Aluminosilicate Microsphere Filler

GYLON® Style 3565 ENVELON™ is a high performance, aluminosilicate microsphere filled PTFE gasketing material designed to compress and conform to irregular surfaces, giving it a tight seal on glass-lined and wavy flanges.


  • Tight seal
  • Soft, durable exterior conforms to surface irregularities
  • Ideal for worn, warped, or pitted flanges
  • Stable blue core improves cold flow resistance
  • Low bolt load requirements ensure a tight seal on glass-lined or wavy flanges*
  • Direct sintering of GYLON® layers prevents leak paths and adhesive contamination
  • Easy to install
  • Custom-cut gaskets from large sheets offer convenience while reducing costly inventory buildup
  • Ideal replacement for slit, milled, formed shield, and double jacketed envelope gaskets* which are prone to foldover during installation
  • Will not support flame
  • Will not support bacterial growth

*When sealing uneven flanges, gasket must be four times thicker than maximum gap between flanges.


  • Available in sheet or cut gasket form
  • White exterior and blue interior
  • PTFE with Aluminosilicate microspheres
  • 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


  • Hydrocarbons
  • Solvents
  • Moderate concentrations of acids and caustics
  • Cryogenics
  • Glass-lined Equipment
  • Hydrogen peroxide
  • Refrigerants
GYLON Style 3565 ENVELON™ Gasketing