LOCTITE® 518

Features and Benefits

This general-purpose, semi-flexible anaerobic-curing gasketing product is ideal for sealing close-fitting, rigid machine flanges made of aluminium, 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 aluminium 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 aluminium with a low copper content. You can expect gap-filling performance to 0.25 mm (0.01"). 
  • Semi-flexible anaerobic flange sealant
  • Adapts to surface irregularities and offers a gap fill up to 0.25 mm (0.01")
  • 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
2069174 en-TZ
IDH: 2069174
EAN: 5010266012162

Size Case: Standard Cartridge

Quantity: 10.0/case

2069177 en-TZ
IDH: 2069177
EAN: 5010266012131

Size Case: Standard Cartridge

Quantity: 10.0/case

Download SDS

Download RoHs

2392090 en-TZ
IDH: 2392090
EAN: 4058093019474

Size Case: Pen

Quantity: 12.0/case

Download SDS

Download RoHs

No documents found

Technical Information

Application method Dispense system, Manual
Applications Rigid assembly gasketing, Sealing
Chemical basis / base Dimethacrylate ester
Colour 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: aluminium, 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)

How to

Step by Step Guide

1. Preparation - Cleaning

Apply LOCTITE® SF 7200 and use a wooden or plastic scraper to remove any residual/cured gasketing material. Remove any burrs that may create shimming between the flanges. It is recommended to use LOCTITE® SF 7063/7064 to degrease and clean surfaces prior to applying the adhesive.

2. Preparation - Activation

If cure speed of LOCTITE® 518 is too slow due to passive metals or low temperature (below 5°C), use activator LOCTITE® SF 7240 or LOCTITE® SF 7649 (see cure speed vs activator graph in the TDS).

3. Application

Apply as a continuous close bead onto one flange surface. Place the bead close to the inner rim of the flange and encircle all holes. Small scratches can 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.

5. Disassembly

Disassemble bolts with standard hand tools. Use jacking-screws, cast-on bosses or recesses to lift flanges apart. For corroded or seized parts, use LOCTITE® LB 8040 Freeze and Release.

Frequently Asked Questions