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White silicone sealant in 85 g tube Loctite 135506

Loctite

Loctite 135506 Sealant 85 g Tube White Silicone Base

SKU CH-DA08-T2RXE

White silicone gasket sealant paste resists ozone, UV, and automotive fluids from -65 °F to 450 °F with a 30-minute working time and full cure in one day

  • Seals gaskets reliably at up to 450 °F
  • Remains flexible down to -65 °F for cold environments
  • Ready for service after one day full cure
  • Resists ozone and UV exposure for lasting durability
  • Works on glass, fiberglass, metal and rubber parts

Silicone Gasket Sealant 85 g

Loctite 135506 is a white silicone-based paste designed for sealing gaskets on glass, fibreglass, metal and rubber components. It resists automotive fluids including ethylene glycol, lubricating oil, grease and water. The product cures at room temperature to form a flexible, ozone and UV resistant seal.

Temperature Range and Cure Schedule

The sealant withstands continuous operating temperatures from -65 °F to 450 °F. It offers a working time of 30 minutes after application and reaches full cure in one day at room temperature. These limits define the environments where the cured gasket will maintain integrity without degradation.

Replaces Cut Gaskets and RTV Alternatives

This formulation replaces pre-cut paper, cork or rubber gaskets where a form-in-place seal is preferred. The jump is worthwhile when flange surfaces are irregular, when disassembly is frequent or when resistance to ozone and UV exposure is required. It is not suited for structural bonding or high-pressure hydraulic systems.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 83% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

How do I choose the right size for my job?

The 85 g tube contains 2.71 fl oz of paste, which covers small to medium gasket repairs or sealing tasks on automotive components.

What does the 450 °F maximum temperature mean once the sealant is in the engine?

After a full cure of one day at room temperature, the silicone base withstands continuous exposure up to 450 °F and remains flexible down to -65 °F, suitable for hot engine surfaces and cooling-system joints.

What does the SI 594 series designation tell me about the product standard?

SI 594 identifies this as a room-temperature-curing, ozone- and UV-resistant silicone gasket sealant designed for automotive fluids such as oil, coolant and water on metal, glass, fiberglass and rubber.

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