Loctite 518


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Loctite 518 is a single component, medium strength, anaerobic sealant which cures when confined in the absence of air between close fitting metal surfaces. Typical applications
include sealing close fitting joints between rigid metal faces and flanges. Provides resistance to low pressures immediately after assembly of flanges. Typically used as a form-in-place
gasket on rigid flanged connections, e.g. gearbox and engine casings, etc. The thixotropic nature of Loctite 518 reduces the migration of liquid product after application to the

Loctite 518 provides robust curing performance. It not only works on active metals (e.g. mild steel) but also on passive substrates such as aluminum with a low copper content. The product offers gap performance to 0.25 mm (0.01 in) and contamination tolerance. It cures in the presence of minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids and cleaners containing surfactants and corrosion inhibitors.

This product may vary on delivery times.

Minimum Order Quantity:

  • 25 ml: 12;
  • 50 ml: 10;
  • 300 ml: 1.
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NSF International

Registered to NSF Category P1 for use as a sealant where there is no possibilty of food contact in and around food processing areas. Note: This is a regional approval. Please contact your local Technical Service Center for more information and clarification.

NSF International

Certified to ANSI/NSF Standard 61 for use in commercial and residential potable water systems not exceeding 82° C. Note: This is a regional approval. Please contact your local Technical Service Center for more information and clarification.


  • Specific Gravity @ 25 °C 1.1
  • Flash Point – See SDS
  • Viscosity, Brookfield – HBT,25°C,mPa·s (cP):
    • Spindle TC, speed 0.5 rpm, Helipath 3,000,000 to 4,500,000LMS
    • Spindle TC, speed 5.0 rpm, Helipath 500,000 to 1,000,000LMS

Instant Sealing Capability

Anaerobic sealants have the ability to resist low on-line test pressures while uncured. This test was performed with uncured product immediately after assembly of an annular steel sealing
surface with an internal diameter of 50 mm (2 in) and an external diameter of 70 mm (2.8 in). Note: Instant sealing capability by application of pen roller will be limited to 0.125 mm (0.005 in) due to the applied film thickness. Pressure Resistance, MPa:

  • Induced Gap 0.05 mm 1.35
  • Induced Gap 0.125 mm 0.14
  • Induced Gap 0.25 mm 0.1

Additional information


Chemical Type

Appearance (uncured)






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