LOCTITE 577 Pipe Sealant

LOCTITE 577 instantly provides a low pressure seal on taper/parallel fittings and when cured with withstand pressures in excess of 500 bar. Fittings are locked and sealed so they will not vibrate loose.

Product Characteristics

  • A liquid sealer which seals threads 100%
  • Approvals for Hot & Cold Water, Potable Water, Gas and LPG
  • Immediate seal: 6 bar


  • Instant seal
  • Easy and clean to apply
  • Seals pipes up to 3” diameter
  • Seals against most solvents and gasses including heating oil, water and gas
  • Can be undone with normal hand tools
  • WRAS registered for use with potable water

Application Examples

✓Oil tank fittings, valves, oil boilers and general use on compression fittings to guarantee a seal.
✓General use on compression fittings to guarantee a seal.

How to Apply:

  • Apply LOCTITE 577 to the leading threads of the male fitting and assemble the parts
  • Lightly tighten and align to the correct position
  • Allow to cure

Technical Data
Maximum Pipe size: 3”
Maximum Temperature: 150°C
Strength: Medium – removal with standard tools


Find out more about LOCTITE 55 and LOCTITE 577 - the perfect sealing combination or get in touch with us:

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