Permatex® OPTIMUM BLACK Gasket Maker

Specially formulated for high flexibility and maximum oil resistance.

  • High Flex: assemblies where dissimilar metals meet
  • Maximum Oil Resistance
  • Temp. Range: -65°F to 500°F
  • Sensor-safe, Low Odor, Non-corrosive
  • Extra Nozzle

OPTIMUM BLACK combines maximum oil resistance with high flexibility.  Today, we see components changing and unlike materials meeting (plastic/steel, aluminum/steel, etc.), all with different rates of expansion and contraction.  In addition, with technology advancing, regulations and requirements tightening, we see thinner metals, fewer fasteners, and wider spread bolt patterns.  The strength and flexibility of OPTIMUM BLACK handle the changes and added stresses that exist between today’s lightweight, high performance, and premium component assemblies.  It is sensor safe, low odor, and non-corrosive with resistance to oil, shop fluids, and vibration.  Also, an extra nozzle is included adding convenience, eliminating the hassle of a clogged nozzle, and allowing multiple uses of each tube without loss of product.  OPTIMUM BLACK is one of the most advanced, high flex, maximum oil resistant RTV silicone gasket makers available.

OPTIMUM BLACK  Suggested Applications:

  • High Flex: assemblies where dissimilar metals meet.
  • For newer lightweight & premium components where maximum oil resistance is required.

Valve covers, oil pans, oil pumps, intake manifold end seals, and timing gear covers.

US Item #CDN Item #Container SizeCase
27037N/A3.35 oz tube, 2 nozzles, carded12
US Item #Tech Doc File
27037TDS  SDS  

OPTIMUM BLACK Instructions:

  1. For best results, surfaces should be clean and dry.
  2. Cut nozzle and apply a continuous 1/16” to 1/4” (2 to 6mm) 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.
  3. Let dry for one hour then tighten to torque specifications.
  4. Allow 24 hours to fully cure before filling with fluids or returning to service.
  5. Replace cap after use.

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

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Tech Documents

Type the appropriate five-digit US Or Canadian part number(s) into the field and click on the Search button. If entering more than one five-digit part number, please separate by a comma. For example: 25224,25218,24010,27010