LOCTITE® 518 is a general-purpose, primerless, semi-flexible, form-in-place anaerobic flange sealant. It cures – even in the presence of minor surface contaminants – to seal close-fitting joints between rigid metal flanges, and will flex with minor flange movements. It provides resistance to low pressures immediately after the assembly of flanges and is ideal for use on aluminum substrates where you need very good flexibility. Typically used as a form-in-place gasket for pumps, thermostats, compressors, transmission housings and axle covers, it not only works on active metals (e.g. mild steel) but also on passive substrates, such as aluminum with low copper content. You can expect gap performance to 0.01" (0.25mm).

Technical Specification:

• Application method: Dispense system, Manual
• Applications: Rigid assembly gasketing, Sealing
• Chemical basis/base: Dimethacrylate ester
• Color: Red
• Cure Type: Anaerobic cure
• Fixture time, Steel: 25.0 min.
• Gap-fill, Unprimed: 0.25 mm
• Key characteristics: Fluorescent, For machined, rigid flanges, Immediate low-pressure sealing, Strength: medium strength, Surface contamination-tolerant, Thixotropic
• Number of components: 1 part
• Operating temperature: -55.0 °C - 150.0 °C (-65.0 °F - 300.0 °F)
• Physical form: Gel
• Recommended for use with: Metal: aluminum, Metal: iron - cast iron, Metal: passive metal, Metal: steel
• Specific gravity, @ 25.0 °C: 1.1
• Storage temperature: 8.0 °C - 21.0 °C
• Viscosity: 750000.0 mPa·s (cP)