You are here

GRAPH-LOCK® 3123 / 3125 Flexible Graphite Gasketing

Purified graphite sheet flexible graphite gasketing

The graphite flake has been acid washed, expanded under heat, and then compressed into sheets with a minimum graphite content of 98%. For thicknesses under 1/16” homogenous graphite is used. For thicknesses over 1/16” laminated graphite is used. The laminated graphite sheets are bonded with a proprietary adhesive. This adhesive makes up less than 1% of the total laminated weight.


  • Excellent resistance
  • Pure exfoliated graphite flake material excels in extreme conditions, withstanding heat, pressure and aggressive chemicals
  • Proven fire-safe
  • Reliable
  • Seals easily under moderate bolt load, offers superior torque retention
  • Retains dimensional stability in high temperatures; seals tightly even during pressure fluctuations


  • Available in cut sheet or cut gasket form
  • Min. Temperature:            -400°F     /       -240°C
  • Max. Temperature:            850°F     /       454°C
  • Max. Pressure:            2,000 PSI       /     138 bar
  • Maximum PxT 1/16:        700,000 (°F x PSIG)  /  25,000 bar x °C
  • Maximum PxT 1/8:            350,000 (°F x PSIG)  /  12,000 bar x °C
Find SDS and MSDS Documents