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Loctite SI 5660 - 100 ml, gray silicone sealant
Description
Description
LOCTITE SI 5660 is a one-component gray silicone sealant designed for flat gasket sealing and filling larger gaps. It cures by exposure to atmospheric moisture at room temperature (RTV) and creates a tough, flexible, and non-corrosive seal.
Due to its high resistance to oils and coolants, it is particularly suitable for sealing gearboxes, engine housings, and other industrial components. Its thixotropic consistency limits dripping and unwanted flow of the material after application.
Main advantages
- High chemical resistance – resistant to motor oils, transmission fluids, and water-glycol mixtures.
- Flexible and reliable seals – creates a tough sealing layer that can replace traditional paper or cork gaskets.
- Filling larger gaps – allows sealing of gaps up to 1 mm.
- Thixotropic consistency – limits dripping and facilitates application even on vertical surfaces.
- Non-corrosive composition – suitable for use on metal and selected plastic surfaces.
- Curing at room temperature – one-component product that does not require mixing.
- OEM approved – meets requirements for selected applications in industrial original manufacturing.
Areas of application
- Sealing flanges of gearboxes and engine housings.
- Sealing cast metal parts made of aluminum, cast iron, and steel.
- Sealing oil pans, water pumps, and distribution covers.
- Applications requiring resistance to oils and coolants.
- Sealing joints between metal-metal, metal-plastic, and selected plastic parts.
Technical parameters
|
Parameter |
Value |
|---|---|
|
Color |
Gray |
|
Chemical type |
Oxime silicone |
|
Consistency |
Thixotropic paste |
|
Curing |
By atmospheric moisture (RTV) |
|
Operating temperature |
-50 °C to +200 °C |
|
Maximum gap |
1.0 mm |
|
Shear strength (steel) |
1.8 N/mm² |
|
Tensile strength (ISO 37) |
2.4–3.8 N/mm² |
|
Shore A hardness |
45–75 |
|
Elongation at break |
≥ 100 % |
|
Curing depth after 24 hours |
2.5 mm |
|
Time to form a non-sticky surface |
≤ 60 minutes |
|
Specific weight |
1.5 g/cm³ |
|
Extrusion rate (0.62 MPa) |
200–700 g/min |
|
Thermal conductivity |
0.63 W/(m·K) |
Instructions for use
- Surface preparation: The sealing surfaces must be clean, dry, and free of grease. For degreasing metal surfaces, LOCTITE SF 7063 can be used, and for selected plastics, LOCTITE SF 7070.
- Application: Apply the sealant in a continuous bead on one of the sealing surfaces.
- Assembly of parts: Connect the individual components within a few minutes after application, before a cured layer begins to form on the surface.
- Curing: The product cures by exposure to atmospheric moisture. The time for complete curing depends on the thickness of the layer, temperature, and humidity of the environment. It is recommended to allow the joint to cure sufficiently (approximately 7 days) before high operational loads are applied.
- Removal of excess material: Uncured sealant can be removed with a suitable non-polar solvent.
