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Blue RTV gasket maker paste in a 300 mL cartridge

Loctite

Loctite 234590 SI 587 RTV Gasket Maker 300 mL Blue

SKU CH-AFHT-FBYXB

Blue oxime silicone RTV gasket maker in a 300 mL cartridge resists oil up to 500 °F and cures at room temperature in one day

  • Low-odour formula improves workshop comfort
  • Non-corrosive oxime silicone protects sensitive metals
  • Withstands -75 °F to 500 °F for extreme engine environments
  • Fills gaps up to 0.25 in for reliable sealing
  • 10-minute working time allows precise application

Product Identity

Loctite SI 587 is a blue oxime silicone RTV gasket maker supplied in a 300 mL cartridge. It forms flexible, oil-resistant seals for automotive and industrial assemblies. Mechanics and maintenance teams use it where conventional gaskets are unavailable or impractical.

Cure and Temperature Limits

The paste skins over in roughly 10 minutes at room temperature and reaches full cure after one day. It remains stable from -75 °F to 500 °F and fills gaps up to 0.25 in. Low-odour, non-corrosive chemistry suits oxygen sensors and copper components.

Installation Notes

Apply a continuous bead to clean, dry flanges and assemble within the working window. Clamping pressure should be even to avoid voids. Common issues include trapped air in deep recesses and premature skinning if the cartridge tip is cut too large.

How it compares

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

Price $41.99
Pricier than about 76% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

Which tube size is right for a single gasket job?

The 300 mL cartridge delivers 10.14 fl oz of paste, enough for several flanges or a full engine reseal.

What does the 500 °F rating mean when the engine is running?

It is the maximum continuous temperature the cured silicone can withstand without breaking down.

How does the room-temperature cure affect installation timing?

The seal skins over in about 10 minutes and reaches full strength after one day at shop temperature.

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