LOCTITE® 518

Features and Benefits

Available sizes:

Standard Cartridge

10.0/case

Standard Cartridge

10.0/case

Pen

12.0/case
TDS Download
Where to Buy
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 performance to 0.25mm.
  • Semi-flexible, medium-strength anaerobic flange gasket
  • For active and inactive rigid metal flanges
  • Cures through minor surface contamination
  • Adapts to flange surface irregularities and gaps up to 0.25 mm
  • Gel-type consistency
  • Seals instantly against low pressure
  • Reduces inventory costs – no need for large inventory of cut gaskets
  • Resists high pressure when fully cured
  • No compression set or misaligned gaskets
  • Easy to automate
  • Reduces process costs – eliminates manual assembly of conventional gaskets
  • NSF P1 Reg. No. 123758
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Documents and Downloads

Technical Data Sheet
LOCTITE® 518™
Download TDS
Safety Data Sheets and RoHs
  • Standard Cartridge 10.0/case - IDH 2069174
  • Standard Cartridge 10.0/case - IDH 2069177
  • Pen 12.0/case - IDH 2392090
2069177 en-GB
IDH: 2069177
EAN: 5010266012131

Size Case: Standard Cartridge

Quantity: 10.0/case

Download SDS

Download RoHs
2392090 en-GB
IDH: 2392090
EAN: 4058093019474

Size Case: Pen

Quantity: 12.0/case

Download SDS

Download RoHs
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Additional Documents

LOCTITE 518 Pen - Vehicle Repair
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English

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.

Where to Buy

Buy Online

LOCTITE® 518
This general purpose, semi-flexible anaerobic-curing gasketing product is ideal for sealing close fitting, rigid machine flanges made of aluminium, iron or steel.
  • Standard Cartridge 10.0/case - IDH 2069174
  • Standard Cartridge 10.0/case - IDH 2069177
  • Pen 12.0/case - IDH 2392090

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    Frequently Asked Questions

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    News & Press Releases

    Loctite 518 - Pen Introduction

    How to Use Video
     

    Versatile gasketing adhesive now available as a Roller Pen

    LOCTITE® 518 gasket sealant just gets better and better.  First introduced to overcome the problems associated with conventional pre-cut compression gaskets, this product has been continuously developed to increase its scope of application. 

    This anaerobic adhesive can now cure through light surface contamination and works well on stainless steel and aluminium without an activator.  And it has also been made available in pen form that delivers the proven leak-fighting properties of LOCTITE 518 via a roller, making application easier than ever with no waste and less mess.

    The major causes of failure and leakage of a compression gasket are poor surface contact, the tendency to relax under dynamic load and bolt hole distortion that cause it to crack and tear.  LOCTITE 518 is the ideal alternative as it fills all voids, resists high pressure and when fully cured maintains clamp load and prevents corrosion. 

    The new...