LOCTITE® 518 Gasket Sealant

Features and Benefits

This general purpose, semi-flexible anaerobic-curing gasketing product is ideal for sealing close fitting, rigid machine flanges made of aluminum, iron or steel.
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 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 a low copper content. You can expect gap performance to 0.01" (0.25mm). 
  • Semi-flexible anaerobic flange sealant
  • Adapts to surface irregularities & gap fill up to 0.01" (0.25mm)
  • Forms an instant low-pressure seal
  • Cures on inactive surfaces without primer
  • NSF registered
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Documents and Downloads

Safety Data Sheets and RoHs
LOCTITE 518, 15gx12un 2091560 en-PE
IDH: 2091560
EAN: 7891200014194

Size Case: Blister Tub

LOCTITE 518, 250g 2091561 en-PE
IDH: 2091561
EAN: 7891200014200

Size Case: crt Standard cartridge

No documents found

Technical Information

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 - 150.0 °C (-65.0 - 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 - 21.0 °C
Viscosity 750000.0 mPa·s (cP)