Loctite SI 5920 Copper RTV Silicone Gasket Maker – 300 ml Cartridge

Loctite SI 5920 is a high-performance, copper-colored RTV (Room-Temperature-Vulcanizing) silicone sealant designed for creating durable, leak-proof gaskets on flanges, pumps, valves, and threaded connections. Once applied and cured, it forms a tough, flexible seal that resists oil, water, and most chemicals, and performs over a wide temperature range from –65 °F to +700 °F. Its thixotropic formula stays in place without sagging, and the 300 ml cartridge fits standard caulking guns for precise, mess-free application.

Wide compatibility: Adheres to metal, ABS, PVC, fiberglass, and most rigid plastics

Fast cure: Tack-free in ~30 minutes; full strength in 24 hours at room temperature

High strength: Shear strength 95 psi; tensile strength 205 psi

Temperature resistance: Operates from –65 °F to +700 °F

Chemical resistance: Withstands oil, coolant, water, and many solvents

Ideal for industrial maintenance, automotive repairs, marine equipment, and HVAC systems where a reliable, oil-resistant gasket is critical.