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GRAPH-LOCK® 3128 HOCHDRUCK® Flexible Graphite Gasketing

Multi-layer graphite with 316SS inserts

GRAPH-LOCK® 3128 HOCHDRUCK® is a multi-layer, high strength sheet material composed of .020” thick layers of high purity flexible graphite (carbon >99.85%) and .002” thick layers of 316 stainless steel foil insert. It provides high compressive strength, blow-out resistance, excellent handling properties, and improved tightness. Depending on the sheet thickness, several layers of graphite and stainless steel are bonded together in a proprietary process; no adhesive is used. Maximum ash content is 0.15%.


  • 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 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
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