Permatex® Ultra Grey® Rigid High-Torque RTV Silicone Gasket Maker

Permatex® Ultra Grey® Rigid High-Torque RTV Silicone Gasket Maker

OEM specified. Permatex® Ultra silicones were developed to meet today’s technology changes. Sensor-safe, low odor, noncorrosive. Outstanding oil resistance and joint movement tolerance. Eight times more flexible than cork/composite gaskets; three times more oil resistant than conventional silicones. Temperature range -65ºF to 500ºF (-54°C to 260°C) intermittent; resists auto and shop fluids and vibration.


• High load resistance

• Improved oil resistance

• Sensor safe, non-corrosive

• Replaces most cut gaskets

• Can be used as a gasket maker or dressing

• Non-flammable, Non-toxic

• Low odor


For assembly as a form-in-place gasket 

1. Remove all previous material from mating surfaces. Permatex Gasket Remover or Silicone Stripper is recommended for most materials.

2. For best results, clean and dry all surfaces with a residue-free solvent, such as Permatex Brake and Parts Cleaner.

3. Cut nozzle to desired bead size, 1/16“ to 1/4“ in diameter. A 1/8” bead is usually sufficient for most applications.

4. Remove cap, puncture tube or cartridge seal and attach extension nozzle.

5. Apply a continuous and even bead of silicone to one surface, first tracing the internal areas of the gasket configuration, then all surrounding bolt holes as shown below: 

6. Assemble parts immediately while silicone is still wet. Secure or tighten to recommended torque specs.

7. Re-torque will not be necessary after the product has cured.

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