LOCTITE® SI 5900™ is a highly effective adhesive sealant designed for use in industrial and professional applications. This versatile product provides exceptional sealing performance, preventing the leakage of fluids, such as oils, coolants, transmission fluids, and hydraulic fluids, commonly caused by vibration and thermal expansion. Its fast-curing formula forms a flexible seal that withstands high temperatures and resists chemicals in demanding environments.
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LOCTITE® SI 5900™ is a high-performance gasket sealer specifically designed to provide reliable sealing and bonding for a wide range of automotive and industrial applications. With its flexible nature, LOCTITE® SI 5900™ can accommodate thermal expansion and vibrations between mating surfaces, commonly experienced in demanding environments. This flexibility ensures a secure and enduring seal, even under dynamic conditions. It also provides excellent sealing capabilities, resisting damage and leaks from fluids, gases, moisture, and other harmful contaminants. Its fast curing time at room temperature allows it to form a resilient, rubber-like elastomer within a short period, reducing assembly time and increasing productivity. In applications where superior heat resistance is required, LOCTITE® SI 5900™ can withstand temperatures ranging from -75°F to 450°F (-60°C to 232°C).
Chemical type: Oxime silicone
Appearance (uncured): Black paste
Viscosity: Thixotropic paste
Cure: Room temperature vulcanizing (RTV)
Specific gravity @ 25°C: 1.3 to 1.37
Extrusion rate, g/min: 20 to 50
Blow-out resistance, seconds (4 mm flange, 1.5 mm gap @ 0.014 MPa): ≥100
Flow, ISO 7390, mm (after 2 minutes @ 25 °C): ≤0.2
Volatile content, %: ≤0.5
Tensile strength, ISO 37 N/mm² (psi): ≥1.7 (≥246)
Primary Chemistry: Oxime silicone
Silicone type adhesive
Excellent resistance to automotive engine oils
Good oil resistance
Tolerates high joint movement
Withstands on line, low-pressure tests
Thixotropic nature
Reduced migration of liquid product
Excellent adhesion profile to a variety of plastic substrates, glass, ceramics, and metals
Wide temperature performance of temperatures are -75°F to 450°F (-60°C to 232°C)
Leak-proof
Blow-out resistance
Sensor-safe
Protects against leaks caused by vibration and thermal expansion
Leaks caused by vibration and thermal expansion
Poor adhesions to plastic substrates, glass, ceramics, or metals
Breakdown of sealant in the presence of high temperatures or chemicals
LOCTITE® SI 5900™ is designed for the sealing of:
-Stamped sheet metal covers, timing covers, and oil sumps
-Automotive and marine gaskets
-Valve covers
-Gearbox covers
-Pumps
-Compressors
-Oil pans
-Thermostat housings
-Water pumps
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