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Medium-strength General purpose flanged sealant with high resistance to contamination. Ideal for cast iron, steel and aluminum flanges.

LOCTITE 518 polymerizes in the absence of air between closely touching metal surfaces. Anaerobic sealant designed for rigid iron, aluminum and steel flanges. Fills gaps up to 0.25 mm forming an elastic layer resistant to chemicals. It is not subject to breaks, does not decompose. The connection can be easily removed even after long-term use. Typical application: sealing of closely connected joints between rigid metal surfaces and flanges. The sealant is also used for forming in-situ seals in rigid flanged connections, for example, for transmission and engine housing.

NEW: Company Henkel has improved the formula of LOCTITE 518:

  • Increased resistance to dirty surfaces
  • Increased elasticity, improved adhesion;
  • More efficient sealing
  • Filling the gaps
  • Increased efficiency on inactive metals without the use of an activator


  • The semi-stretched anaerobic flange sealant medium strength 
  • For rigid flanges made of active and inactive metals
  • Provides sealing even with small contamination
  • Fills gaps up to 0.25 mm
  • The gel base
  • Instant sealing
  • Cost reduction: no need to store a variety of gaskets in the warehouse
  • When fully polymerized, it can withstand high pressure
  • Does not shrink or shift
  • Process automation is possible
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