Loctite 5699 belongs to the RTV silicone (Room Temperature Vulcanizing) sealant group, different from the 510/518 (anaerobic) or 542/565/567 (thread sealant) lines. This is an elastic, neutral silicone, specialized for sealing flexible flanges, especially in environments in contact with oil, water, and gas.
🔹 Information about Loctite 5699:
Form: Neutral silicone, dark gray.
Features:
Specialized for flexible flange sealing.
Withstands temperatures from -55°C to +200°C continuously, can withstand up to +250°C for a short time.
Resistant to oil, coolant, compressed air, water, solvents.
High elasticity, suitable for surfaces subject to vibration and thermal deformation.
Medium viscosity, easy to pump and spread evenly.
Surface film formation time: ~10 minutes, completely cured after 24 hours (depending on thickness).
Can replace pre-cut gaskets.
🔹 Practical applications:
Sealing of car engine flanges, gearboxes, valve covers, oil caps.
Pump systems, compressors, metal flanges with slight deformation.
Used in environments with engine oil, gearbox oil, coolant.
Especially popular in the automotive, mechanical, and equipment maintenance industries.
👉 Summary:
Loctite 510/518: sealing hard metal flanges (compressors, pumps, gearboxes).
Loctite 5699: sealing flexible, vibration-resistant, oil-resistant flanges → very suitable for engines, cars, and machines with thermal deformation.













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