Applications

LOCTITE 518

  • Item Name: LOCTITE® 518™
  • Manufacturer: Henkel
  • Product category: Anaerobic sealant
  • Technologies: Acrylic (Dimethacrylate ester)
  • Applications: Ideal for sealing close-fitting metal joints in gearboxes, engine casings, and similar assemblies.
  • Color: Red gel-like (uncured)
  • Cure type: Anaerobic
  • Package size: Contact to Avantek for details
  • Shelf life: Contact to Avantek for details

1. Product Overview

LOCTITE® 518™ is a single-component, medium-strength, anaerobic sealant that cures in the absence of air between close-fitting metal surfaces. It provides resistance to low pressures immediately after assembly and is designed for sealing rigid metal flanges, such as those in gearbox and engine casings. The product is thixotropic, reducing migration after application.

2. Applications

  • Sealing close-fitting joints between rigid metal faces and flanges
  • Suitable for use on both active metals (e.g., mild steel) and passive substrates (e.g., aluminum)
  • Form-in-place gasket for gearboxes, engine casings, and similar assemblies
  • Works with minor surface contamination from oils and lubricants

3. Typical Properties

Property Value
Uncured Properties
Chemical Type Dimethacrylate ester
Appearance Red, gel-like material
Fluorescence Positive under UV light
Viscosity (25°C, Brookfield HBT) 4,000,000 mPa·s
Cure Mechanism Anaerobic
Strength Medium
Gap Filling Up to 0.25 mm (0.01 in)
Cured Properties (24h at 23°C)
Glass Transition Temperature (Tg) 100°C
Tensile Strength (ISO 527-2) 7.3 N/mm² (1,060 psi)
Elongation at Break (ISO 527-2) 64%
Lap Shear Strength (Steel) 8.4 N/mm² (1,220 psi)
Lap Shear Strength (Aluminum) 5.4 N/mm² (780 psi)
Sealing Capability
Maximum Induced Gap (Steel/Aluminum) 0.25 mm
Instant Pressure Resistance 1.35 MPa (0.05 mm gap)
Environmental Resistance
Heat Resistance Up to 150°C
Cold Strength Tested down to -75°C
Chemical Resistance (5000h) Good resistance to motor oils, ATF, and glycol-water mixtures; limited resistance to gasoline

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