Product Description
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).
Features:
- 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
How To:
1. Preparation – Cleaning:
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.
2. Preparation – Activation
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.
3. Application
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.
4. Assembly
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.
5. Disassembly
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.
Additional Information
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