Loctite Si 5900 Silicone Black (Pressure Pack) 190ml

LOCTITE® SI 5900 is a 1-part, heavy-bodied, silicone-based flange sealant designed for forming gaskets and sealing a wide range of substrates including metal, plastics, glass, and ceramics. It is moisture-cured, offering excellent resistance to oil and joint movement, and suitable for gap filling up to 1 mm (0.04"). Its thixotropic consistency allows precise application, and it can withstand in-line, low-pressure tests before curing. Ideal for stamped sheet-metal covers and other assembly applications requiring durable, flexible sealing.

Key Features:

  • Excellent oil resistance: Maintains seal integrity when exposed to oils.
  • NSF P1 registered: Approved for potable water contact in the USA.
  • Thixotropic: Easy to apply without sagging.
  • Multi-substrate adhesion: Bonds to metal, plastics, glass, and ceramics.
  • High gap fill: Effective for gaps up to 1 mm (0.04").

Technical Specifications:

Specification Details
Colour Black
Cure Type Room temperature vulcanization (RTV) cure
Extrusion Rate 30.0 g/min.
Key Characteristics High adhesion, Excellent oil resistance
Operating Temperature -55.0 - 200.0 °C (-65.0 - 400.0 °F)
Recommended Substrates Metal, Plastic
Storage Temperature 8.0 - 21.0 °C
Tack Free Time 15.0 min.

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