Loctite SI 5699 Grey RTV Silicone Gasket Maker – Oil & Coolant Resistant
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Regular price
$15.00 CAD
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Loctite SI 5699 is a grey, one-part RTV silicone gasket maker designed to form flexible, durable seals on flanged assemblies. Its non-corrosive oxime-silicone chemistry is especially useful for rigid flange sealing where resistance to motor oil and water/glycol coolant mixtures is required, including transmissions and cast-metal housings.
Key Benefits
- Forms a flexible, moisture-cured silicone gasket directly on the assembly.
- One-part, thixotropic paste requires no mixing and resists slumping after application.
- Provides excellent oil resistance and documented resistance to water/glycol mixtures.
- Non-corrosive formulation is suitable for corrosion-sensitive assemblies.
- Works on machined, cast, flexible, metal and compatible plastic flange surfaces.
- Tack-free in 30 minutes or less under the TDS test conditions.
Popular Applications
- Transmission and gearbox housings
- Cast-metal and machined flanges
- Powertrain and heavy-equipment assemblies
- Industrial machinery housings and covers
- Metal or compatible plastic flange sealing
- Assemblies exposed to oil or water/glycol coolant
Product Specifications
| Technology | Silicone |
|---|---|
| Chemical type | Oxime silicone |
| Appearance | Grey thixotropic paste |
| Components | One component; no mixing required |
| Cure system | Moisture-cure, room-temperature vulcanizing (RTV) |
| Primary application | Flexible form-in-place flange sealing |
| Specific gravity | 1.45 at 20°C |
| Extrusion rate | At least 200 g/min from a Semco cartridge at 0.62 MPa, 25°C, over 15 seconds |
| Tack-free time | 30 minutes maximum at 25°C and 50 ± 5% relative humidity |
| Operating temperature | -55°C to 200°C (-65°F to 400°F) |
| Shore A hardness | 45–75 after one week at 50 ± 5% relative humidity |
| Elongation | At least 100% per ISO 37 after one week at 50 ± 5% relative humidity |
| Tensile strength | At least 2.4 N/mm² (348 psi) per ISO 37 after one week at 50 ± 5% relative humidity |
| Optimal storage | 8°C to 21°C (46°F to 70°F), unopened and dry |
| NSF registration | NSF Category P1 for use as a sealant where there is no possibility of food contact; regional approval |
Typical Lap-Shear Performance
The following TDS values were measured after 14 days of cure at 23°C and 60 ± 5% relative humidity with a 0.5 mm bond gap.
| Substrate | Lap-shear strength |
|---|---|
| Aluminum | 0.1–0.7 N/mm² (15–102 psi) |
| Zinc dichromate | 0.7–1.5 N/mm² (102–213 psi) |
| Mild steel, grit blasted | 1.3–2.1 N/mm² (189–305 psi) |
| Aluminum, abraded | 1.3–2.0 N/mm² (189–290 psi) |
Application and Cure Guidance
- Clean mating surfaces thoroughly and remove grease.
- Apply the sealant and assemble the parts within a few minutes. Moisture curing begins as soon as the material is exposed to air.
- Allow the assembled joint to cure before heavy service; the TDS uses seven days as an example for heavy-load exposure.
- Before cure, excess material can be removed with a suitable non-polar solvent such as mineral spirits or a naphtha-based cleaner.
Important Limitations
Not recommended for contact with gasoline, pure oxygen or oxygen-rich systems, chlorine, or other strong oxidizing materials. Cure speed and depth depend on temperature, humidity and joint thickness. Review the package-specific SDS and product label before use.
View the Henkel Technical Data Sheet. Product packaging varies by selected size.