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Permatex® Sensor-Safe High-Temp RTV Silicone Gasket Maker


Features and Benefits:

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.


  1. For best results, clean and dry all surfaces with a residue-free solvent such as Permatex® Brake Cleaner.
  2. Cut nozzle to desired bead size. Gaskets are best formed using a _?__” to _?_” bead.
  3. Apply a continuous, even bead of silicone to one surface, surrounding all bolt holes. Assemble parts immediately while silicone is still wet. Finger tighten until material begins to squeeze out around flange. Allow to dry for onehour then retighten _?_ to _?_ turn.
  4. Silicone will skin over in one hour and fully cure in 24 hours under normal conditions. Allow more time for coldor very dry conditions.
  5. Clean uncured silicone from hands, tools and clothing with Permatex® Fast Orange® Hand Cleaner.

NOTE: Not recommended for use on head gaskets or parts in contact with gasoline.

NOTE: Due to warranty issues, technology changes (i.e. sensors, etc.), aluminum components, Part No. 27BR can be replaced with ULTRA COPPER®, Part No. 81878 for optimal sealing performance.


Suggested Applications:

Valve covers, oil pans, timing covers, water pumps, and thermostat housings.

View Permatex® Sensor-Safe High-Temp RTV Silicone Gasket Maker SDS HERE