Permatex 81422 High-Temp RTV Silicone Gasket, 3 Oz

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Sensor safe, use for valve covers, oil pans, timing covers, water pumps, thermostat housings and transmission pans, can be used as a gasket maker or dressing, non-flammable.
SKU: 41521152
MFG: 81422
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Permatex Sensor-Safe Hi-Temp RTV Silicone Gasket is a single component, room temperature vulcanizing gasketing compound designed to provide reliable "formed-in-place" gaskets for mechanical assemblies. This material cures on exposure to moisture in the air to form a tough, flexible, silicone rubber gasket. The product resists aging, weathering and thermal cycling without hardening, shrinking or cracking. Designed to be oxygen sensor safe, and maintain maximum performance in a continuous temperature environment of 600°F.

The high temp first generation gasket maker formulated for oxygen sensor equipped engines. Temperature range of -65°F to 650°F (-54°C to 343°C) intermittent; resists auto and shop fluids.


  • High temperature use
  • Sensor safe
  • Easy application
  • Superior adhesion and flexibility
  • Replaces most cut gaskets
  • Can be used as a gasket maker or dressing
  • Non-flammable
  • Formulated for oxygen sensor equipped engines
  • First generation 1970-1980 gasket maker
  • -75 to 650 degrees Fahrenheit temperature range
  • Resists auto and shop fluids
  • Use for valve covers, oil pans, timing covers, water pumps, thermostat housings and transmission pans


  • Chemical Type: Acetoxy silicone rubber
  • Appearance: Red non-sag paste
  • Type: High Temperature
  • Size: 3 Oz
  • Packing Type: Tube
  • V O C Content: 3 %
  • Form: Paste
  • Color: Red
  • Odor Scent: Mild Acetic Acid
  • Usage: For Oxygen Sensor Equipped Engines
  • Flash Point: 200 deg F
  • Composition: RTV Silicone, Poly Hydroxy, Amorphous Silica
  • Flammability Rating: 1
  • Extrusion rate @ 25_C, (grams/min): >100
  • Specific Gravity: 1.05


  • Intake manifolds
  • Thermostat housings
  • Valve covers
  • Timing gear covers
  • Water pumps
  • Oil pans
  • Transmission pans

Typical Curing Performance:

Permatex Sensor-Safe Hi-Temp RTV Silicone Gasket cures on exposure to moisture in the air. The product dries tack free in one hour and fully cures in 24 hours. Cure times will vary with temperature, humidity and gap. Note: The curing process can cause corrosion to some surfaces, for critical applications use the Ultra Series silicones.

Chemical/Solvent Resistance:

The product retains effective properties in contact with automotive fluids, such as motor oil, transmission fluids, alcohol and antifreeze solutions. Note: Not recommended for parts in contact with gasoline.


MFR: 81422
SKU: 41521152
UPC: 686226814227
Brand: Permatex
Attachments: MSDS Sheets,