Hardex Clear Silicone is a 100% RTV (Room Temperature Vulcanizing) rubber sealant that cures in moisture to form a durable, flexible seal. It provides excellent adhesion for non-porous materials like glass, metal, and ceramic,, making it ideal for automotive gaskets, household repairs, and weatherproofing within a -80ºF to 500ºF range.Â
Key Features and Benefits
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- 100% Silicone Rubber: Remains permanently flexible, durable, and waterproof.
- High Temperature Resistance: Stable at temperatures from 75ºF to 500ºF or up to 625ºF intermittent for specific gasket types.
- Versatile Adhesion: Bonds well to glass, metal, ceramics, rubber, and plastics.
- Fast Curing: Sets in 15 minutes, can be handled in 1 hour, and fully bonds within 24 hours.
- Non-Corrosive: Low odor and sensor-safe, suitable for automotive, industrial, and household applications.Â
Common Applications
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- Automotive: Valve covers, intake manifold end seals, timing covers, and water pumps.
- Household: Sealing windows, glass, and ceramics, as well as weatherproofing.
- Industrial: General-purpose sealing and bonding.Â
Application Instructions
- Ensure surfaces are clean, dry, and free from oil or grease.
- Remove cap and pierce the seal, then screw on the nozzle and cut it to the desired size.
- Apply an even bead (1/16″ to 1/8″) around the surface perimeter.
- Assemble parts within 15 minutes while the silicone is still wet.
- Clean off excess sealant and replace the cap after use.










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