LOCTITE® SI 5900 Flange Sealant

Known as LOCTITE 5900

Features and Benefits

Silicone-based gasketing product suitable for various substrates. Good resistance to oil and joint movement.
LOCTITE® SI 5900 is a moisture-cured, heavy bodied, silicone-based form-in-place flange sealant with excellent resistance to oil and joint movement. Its heavy bodied properties allow it to withstand on line, low pressure tests before the product begins to cure. Typical applications include stamped sheet metal covers, and it’s suitable for gaps up to 0.04" (1mm) in metal, plastic, glass, and ceramic substrates. It has a skin-over time of just 15 minutes, and once cured provides a seal that won’t shrink, compress, crack or relax even when exposed to oil or joint movements.
  • Excellent oil resistance
  • Registered to NSF Category P1
  • Thixotropic for ease of application
  • Adheres to metal, plastic, glass, ceramic
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Technical Information

Color Black
Cure type Room Temperature Vulcanization (RTV) Cure
Extrusion rate 30.0 g/min.
Key characteristics Adhesion: High Adhesion, Oil Resistance: Excellent Oil Resistance
Operating temperature -65.0 - 400.0 °F (-55.0 - 200.0 °C )
Recommended for use with Metal, Plastic
Storage temperature 8.0 - 21.0 °C
Tack free time 15.0 min.