LOCTITE® 518

Features and Benefits

LOCTITE 518 is a medium-strength, general purpose gasketing product with excellent contamination tolerance. Ideal for use on casted iron, steel and aluminium flanges.
LOCTITE® 518 cures when confined in the absence of air between close-fitting metal surfaces. It is an anaerobic gasketing material designed for use on rigid iron, aluminum, and steel flanged mating surfaces. LOCTITE 518 fills gaps up to 0.25mm and forms a flexible, chemical-resistant seal that will not tear or decay. Parts disassemble easily, even after extended service. Typical applications include sealing close-fitting joints between rigid metal faces and flanges. It is also used as a formed-in-place gasket on rigid flanged connections, e.g. transmissions and motor housings.
  • 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

Safety Data Sheets and RoHs
2069177 en-TZ
IDH: 2069177
EAN: 5010266012131

Size Case: Standard Cartridge

Quantity: 10.0/case

2392090 en-TZ
IDH: 2392090
EAN: 4058093019474

Size Case: Pen

Quantity: 12.0/case

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