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Gray 300 mL cartridge of Loctite SI 5999 silicone gasket maker paste

Loctite

Loctite 231230 Silicone Gasket Maker 300 mL Gray

SKU CH-39AP-V83N1

Gray RTV silicone gasket maker cures at room temperature in seven days, resists oil and temperatures from -65 °F to 550 °F, and fills gaps up to 0.25 in

  • Withstands extreme heat up to 550 °F
  • Remains flexible in cold down to -65 °F
  • Fills gaps up to 0.25 in on metal surfaces
  • 10 min working time allows precise positioning
  • Resists oil and high temperatures for lasting seals

What this gasket maker does

Loctite 231230 is a room-temperature-vulcanising silicone paste supplied in a 300 mL cartridge. It forms flexible, oil-resistant gaskets on metal flanges and housings. The grey compound withstands continuous temperatures from -65 °F to 550 °F. Full cure is reached after seven days.

Suited for original-equipment repairs

Mechanics resealing engine, transmission or differential covers will find the 0.25 in gap-fill capacity and ten-minute working time practical. The product is not intended for structural bonding, large voids beyond the stated gap limit, or non-metallic substrates that require a different chemistry.

Deciding specification: temperature range

The -65 °F to 550 °F operating window determines whether the seal survives the application. Verify that the assembly never exceeds these limits before selecting this compound.

How it compares

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

Price $53.99
Pricier than about 81% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

How do I install the Loctite 231230 cartridge and what is the common mistake?

Load the 300 mL cartridge into a caulk gun, apply a continuous bead on one clean flange, then assemble within the 10 min working time; the frequent error is waiting longer than 10 min before mating the parts.

What maintenance or replacement will the cured gasket need later?

Once fully cured after 7 days the silicone gasket remains in place for the life of the joint; no scheduled maintenance or replacement is required unless the seal is damaged or the assembly is disassembled.

What limit appears first during sustained high-temperature use?

The maximum continuous operating temperature is 550 Degrees F; exceeding this limit will degrade the silicone before any other property becomes critical.

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