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Copper-coloured RTV gasket-maker paste in a 70 mL tube

Loctite

Loctite 198818 Copper RTV Gasket Maker 70 mL

SKU CH-TR52-RYM3K

Copper RTV gasket maker forms flexible, high-temperature seals resistant to oil and corrosion

  • Withstands extreme heat up to 700 °F
  • Remains flexible down to -65 °F
  • Oil-resistant formula protects engine sealing surfaces
  • Ready for service after one day full cure
  • Fills gaps up to 0.04 in with copper RTV paste

Loctite SI 5920 Copper RTV Gasket Maker

This Loctite SI 5920 copper RTV gasket maker is a high-temperature resistant paste designed for sealing rigid flanges in automotive and industrial assemblies. It suits mechanics and technicians who need a reliable, oil-resistant sealant that cures at room temperature to form a durable, flexible gasket.

Thermals, noise and power draw

The product withstands continuous operating temperatures from -65 °F to 700 °F without degrading, making it suitable for extreme thermal cycling in engine and exhaust environments. As a non-corrosive, room-temperature curing paste, it requires no external heat or power during application or curing.

Sustained load behaviour

After a one-hour working time, the sealant achieves full cure in one day, developing a tough rubbery bond that maintains its sealing properties under prolonged vibration, pressure and thermal stress. It fills gaps up to 0.04 in and resists oil and coolant exposure over extended service intervals.

How it compares

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

Price $12.99
Cheaper than about 63% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameLOCTITE

Questions about this item

How do I apply the Loctite 198818 copper RTV gasket maker from the 70 mL tube, and what is the step people often get wrong?

Apply a continuous bead to one clean flange, assemble the parts within the 1-hour working time, then torque to specification; the frequent error is disturbing the joint or starting the engine before the full 1-day room-temperature cure is complete.

What maintenance or replacement will the cured Loctite 198818 gasket need later?

The cured RTV forms a permanent, flexible seal rated from -65 °F to 700 °F; it requires no scheduled maintenance, but should be inspected whenever the joint is opened and replaced if cuts, hardening or leakage appear.

What limit appears first when the Loctite 198818 gasket is under sustained high-temperature use?

The 700 °F maximum operating temperature is the primary ceiling; sustained exposure beyond that will degrade the silicone matrix faster than the 0.04 in gap-fill capacity or the oil-resistant chemistry.

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