Loctite SI 587 - Flange Sealant - 300ml

LOCTITE SI 587 is a high-performance, one-component, blue RTV silicone sealant designed for gasketing, sealing, and flange applications. It cures at room temperature when exposed to atmospheric moisture and forms a tough, flexible silicone rubber that provides reliable sealing against water, oils, vibration, and temperature fluctuations.

LOCTITE 587 is particularly suitable for applications where a flexible, chemically resistant seal is required. It can be used to form or replace conventional gaskets on properly prepared metal and other compatible surfaces. Its excellent flexibility helps accommodate thermal expansion and contraction while maintaining a dependable seal.

The product is commonly used in automotive, machinery, industrial equipment, pumps, gearboxes, engine components, covers, housings, and flange assemblies. The blue formulation also makes the sealant easy to identify during assembly and maintenance.

Key Features:

One-component, ready-to-use RTV silicone

Blue silicone formulation

Excellent flexibility and vibration resistance

Suitable for gasket forming and flange sealing

Good resistance to moisture, oils and environmental conditions

Helps seal irregular or machined flange surfaces

Cures at room temperature

Suitable for maintenance, repair and assembly applications

Available in a 300 ml cartridge format

Typical Applications:

Engine and transmission covers

Gearboxes and housings

Pumps and compressors

Flanges and machine assemblies

Automotive and industrial equipment

Replacement of conventional formed-in-place gaskets

Sealing joints exposed to vibration and thermal cycling

Temperature Resistance:

LOCTITE SI 587 is designed for high-temperature sealing applications and can withstand temperatures up to approximately 260°C (500°F), depending on the application and service conditions.

Important: Surface preparation, joint design, curing conditions and chemical exposure can affect final performance. Always verify compatibility and the latest technical specifications in the applicable Henkel Technical Data Sheet before use.