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.
Size Please make your selection 6 ml
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- Description
- Technical specification
- Ratings & reviews
- Question & answer
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).
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Semi-flexible anaerobic flange sealant
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Adapts to surface irregularities & gap fill up to 0.01" (0.25mm)
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Forms an instant low-pressure seal
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Cures on inactive surfaces without primer
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NSF registered
Product category:
Gasketing sealants
Technologies:
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Acrylates, anaerobic cure
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)
How to use
Apply LOCTITE® SF 790 to old gasket or gasket sealants and use a wood or plastic scraper to remove residues from flange surfaces. Remove burrs. It is recommended to use LOCTITE® SF 7070 to degrease and clean surfaces prior to applying the sealant.
If cure speed of LOCTITE® 518 is too slow due to passive metals or low temperature (below 5°C), use LOCTITE® SF 7649 activator. Allow to dry.
Apply a continuous bead of sealant onto one flange surface. Place the bead close to the inner rim of the flange and encircle all bolt holes. Small surface scratches will be filled by the adhesive. LOCTITE® 518 can also be applied by roller onto larger flanges.
Assemble flanges and tighten bolts as soon as possible. Wipe away any excess squeeze-out, as this will not cure when exposed to air due to sealant's anaerobic curing properties.
Disassemble bolts with standard hand tools. Use jacking-screws, cast-on bosses or recesses to lift flanges apart. Once disassembled, apply LOCTITE® SF 790 on old sealant and use a wood or plastic scraper to remove residues from flange surfaces.
For corroded or seized parts, use LOCTITE® LB 8040 Freeze and Release.
FAQ
Use a LOCTITE® gasketing adhesive (silicone or anaerobic depending on your application) to: completely fill voids and surface variations; replace or augment traditional gaskets; overcome typical issues of over-torqueing bolts and gasket relaxation; as well as reducing inventory with a ‘one size fits all’ solution.
Yes, Henkel anaerobic adhesives become highly resistant thermoset polymers once cured, making them suitable for a vast number of applications. Consult the online product resources or contact our technical teams for further information.
LOCTITE® silicone adhesives such as LOCTITE® SI 5920 or LOCTITE® SI 5699 have been specially formulated for high temperature engine sealing applications. However due to the very high temperatures generated in the combustion chamber care should be taken when specifying liquid gasketing materials around the cylinder head or exhaust manifold. Please consult the Henkel technical team for further advice where necessary.
All necessary H&S measures and PPE (personal protection equipment) requirements can be found on the product material safety data sheet, all of which are available via our website.
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