GYLON® Style 3565 ENVELON® Gasketing

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
  • Bolt Circle Diameter (Inch)3.500
    Bolt Circle Diameter (mm)88.90
    Bolt Hole Diameter (Inch)0.750
    Bolt Hole Diameter (mm)19.05
    Bolt Hole Quantity4
    CompliancesFDA Compliant, REACH Compliant, RoHS Compliant
    CompositionPTFE with Aluminosilicate Microspheres
    Flange Standards/Pressure ClassASME B16.5 Class 300
    Gasket TypeFull Face
    Inside Diameter (Inch)1.313
    Inside Diameter (mm)33.35
    Min Temperature (C)-268
    Min Temperature (F)-450
    Nominal Pipe Size (inch)1.000
    Nominal Pipe Size DN (mm)25.0
    Nominal Pipe Size Fraction (Inch)1
    Outside Diameter (inch)4.875
    Outside Diameter (mm)123.83
    Pipe Standard and ClassASME B16.5 Class 300
    Pressure Class300
    Pressure Max (bar)55
    Pressure Max (psi)1200
    Primary Dimensional Unit of MeasureImperial
    Primary Nominal Thickness1/16 in
    Rubber MaterialPTFE
    Rubber Material AbbreviationPTFE
    Style/ModelStyle 3565
    Temperature Range (C)-268°C to 260°C
    Temperature Range (F)-450°F to 500°F
    Thickness (inch)0.063
    Thickness (mm)1.60
  • Hydrocarbons
  • Solvents
  • Moderate concentrations of acids and caustics
  • Cryogenics
  • Glass-lined Equipment
  • Hydrogen peroxide
  • Refrigerants
GYLON® Gasketing Style 3565

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GYLON® Gasketing Style 3565

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