Anti-corrosion Compressed Non-Asbestos Fiber Sheet

Compressed Non-Asbestos Fiber Sheets are rolled and vulcanized sheet type gasket materials, in which special rubber binders and a small amount of filler material are mixed with organic and inorganic fibers.

With reduced amounts of leachable chloride, these Compressed Fiber Sheets have corrosion suppression effect when stainless steel flanges are used for water or water solutions. Surface finishing reduces sticking to the flange.



Unsuitable fluids Strong acid, strong alkali, and various solvents, inflammable gas, gas susceptible to burn and toxic gas
Applications Stainless steel pipe flanges, valve bonnets and other equipment used in various industries requiring corrosion resistance
Dimensions Width × Length (mm): 1270 × 1270、1270 × 3810、2540 × 3810
Thickness (mm): 1.0、1.5、2.0、3.0
Color type: blue
Print color: orange

Design Data

  • Recommended tightening stress
    Tightening stress is defined as the pressure required under standard conditions without consideration to the opening force due to internal fluid.

    Fluid Recommended tightening stress (MPa)
    Liquid 25.5
    Gas 40.0
  • Available ranges
    Temperature and pressure classifications show individual service limits.

    VALQUA No. Temperature (°C) Pressure (MPa)
    Water based Oil based(2) Gas
    6500 / 6500AC -50~183 3.0 3.0 1.0
    6502 / 6503 / 6503AC -50~214 3.0 3.0 1.0

    (1) For service conditions exceeding 100°C, please refer to the notes on page 10.
    (2) Regarding oil gas, solvent and corrosive fluid, separate consultation is required.

  • m,y values
    The m, y values for Compressed Fiber Sheets defined in Appendix G of JIS B 8265 can be applied to the m, y values of Compressed Non-Asbestos Fiber Sheets.

    Gasket factor
    Minimum design seating stress
    3.0 2.00 11.0
    1.5 2.75 25.5
    1.0 3.50 44.8
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