Garlock 9900 (Mahogany Sheet)

Garlock HIGH-TEMP 9900 Graphite fiber/graphite flake, high-temperature fillers and a nitrile binder.


A high temperature gasket sheet of graphite fibers/flake and a nitrile binder that is the most versatile of the high-temperature, high pressure CNA gasket sheets on the market.

These hi-temp gasket materials have been laboratory tested for fire safety. They maintain effective seal during pressure and temperature fluctuations. Garlock high temp gasket materials’ superior torque retention lowers leakage rates and reduces maintenance time.


  • Heat and oxidation resistance
  • Graphite fiber gasketing withstands extreme temperatures and pressures, as well as many chemicals
  • Passed Garlock Fire tests, and is ABS Fire Safe Type Approved
  • Long-lasting seal -Unique manufacturing process minimizes cold flow and creep relaxation problems
  • Versatile – Ideal for standard ANSI flanged connectors, as well as turbine crossover piping connectors
  • Multiple applications in power generation, chemical processing, hydrocarbon processing, and other industries

Compatible With:

  • Steam*
  • Oils
  • Grease
  • Water
  • Heat transfer fluids+

+Contact Garlock Engineering with specific transfer fluid application.

*Minimum recommended assembly stress = 4,800psi. Preferred assembly stress = 6,000-10,000psi. Gasket thickness of 1/16″ strongly preferred. Retorque the bolts/studs prior to pressurizing the assembly. For saturated steam above 150psig, consult Garlock Engineering.


Garlock High-Temp 9900 Gasket Sheets are available in these sizes:

1/64”X 60”X 60”
1/64”X 60”X 120”
1/32”X 60”X 60”
1/32”X 60”X 120”
1/16”X 60”X 60”
1/16”X 60”X 120”
3/32”X 60”X 60”
3/32”X 60”X 120”
1/8”X 60”X 60”
1/8”X 60”X 120”

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


Min. Temp-100°F
Max Temp1000°F
Continuous Max650° F
Max Pressure2,000 PSI
Max PXT 1/16”700,000 (°F X PSIG)
Max PXT 1/8”350,000 (°F X PSIG)

ASTM F104 Line Call Out: