Loctite 518 Flange Sealant


Loctite 518 Flange Sealant

Loctite 518 is designed for use on rigid iron, aluminum, and steel flanged mating surfaces. Fills gaps up to 0.25mm and forms a flexible, chemical-resistant seal that will not tear or decay. Typical applications include sealing close fittings on transmissions, motor housings etc.


  • Prevents leakage: It fills all gaps between the mating flange parts and cures into a hard thermoset plastic that fills all surface irregularities providing 100% seal.
  • Adapts to flange surface irregularities and scratches up to 0.25 mm.
  • Eliminates gasket compression set.
  • Reduces inventory cost and complexity as one tube can make many different shapes and sizes of gaskets.
  • Provides instant seal.
  • Ideal for use on rigid metal parts, e.g. cast iron components and pump housings.
  • High oil resistance.
  • Excellent water and glycol resistance.


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