LOCTITE® 518 is an anaerobic flange sealant designed for application to rigid mating surfaces made of iron, aluminum and steel. LOCTITE 518 fills gaps up to 0.25 mm in size and forms an elastic, chemically resistant seal with high resistance to rupture or destruction. At the same time, the parts are easily disassembled even after prolonged operation. Typical applications of this product include sealing tight-fitting joints between rigid metal surfaces and flanges. It is also used as a liquid anaerobic sealant in rigid flange connections (for example, in gearboxes and engine crankcases).

  • Semi-solid, anaerobic flange sealant of medium strength
  • For active and inactive rigid metal flanges
  • It cures with a slight contamination of the surface
  • Adapts to flange surface irregularities and gaps up to 0.25 mm
  • Gel-like consistency
  • Instant sealing at low pressure
  • High pressure resistance when fully cured
  • No changes in the structure of gaskets at high pressure
  • It is easy to automate the application
  • NSF P1 Reg. No. 123758


Packing volume 25ml, 50ml, 60ml, 300ml, 80ml
Viscosity (mPa*s) 500000 — 1000000
Endurance medium
Fixing time (on aluminum) 20 min
Fixing time (on steel) 25 min
Maximum clearance (mm) 0,3
Tensile strength (N/mm^2) 7,5
Operating temperature range -50°C...+150°C
Fluorescence Yes
Color red
Chemical basis: Methacrylate

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