VALQUA No. 6502


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.

Calendered gasket material made of selected synthetic organic, inorganic fibers and carbon fiber bonded with special rubber binder using the minimum required amount of organic fiber. It has a wide range of other applications.



Unsuitable fluids Strong acid, strong alkali, and various solvents, inflammable gas, gas susceptible to burn and toxic gas
Applications Joint areas of steam lines, pipe flanges, valve bonnets and other equipment used in oil refineries and chemical industries
Dimensions Width × Length (mm): 1270 × 1270、1270 × 3810、2540 × 3810、3048 × 3810
Thickness (mm): 0.5、0.8、1.0、1.5、2.0、3.0
Color type: gray
Print color: black

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 consult us.
    (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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