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Henkel Adhesive Technologies

Henkel Adhesive Technologies

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Gasketing sealants


General purpose, semi-flexible, rigid machine-flange sealant

This general purpose, semi-flexible anaerobic-curing gasketing product is ideal for sealing close fitting, rigid machine flanges made of aluminum, iron or steel.

All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.

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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). 

Product category:

Gasketing sealants


Application method:

Dispense system,Manual


Rigid assembly gasketing,Sealing

Chemical basis / base:

Dimethacrylate ester



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:


Recommended for use with:

Metal: aluminum,Metal: iron - cast iron,Metal: passive metal,Metal: steel

Specific gravity, @ 25.0 °C:


Storage temperature:

8.0 °C - 21.0 °C


750000.0 mPa·s (cP)

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