LOCTITE NS 5540 Extreme Temperature Sealant

Features and Benefits

LOCTITE® NS 5540 is a thermally reactive, heat-cured, liquid sealant for threads and flanges used in high temperature and high pressure applications.
LOCTITE® NS 5540 is a brown, high strength, thermally reactive, heat-cured, liquid sealant for threads and flanges that is used in high temperature and high pressure applications. It will not cement flanges together thus allowing future repairs of metal-to-metal joints and is unaffected by thermal cycling. It has been successfully used to seal flanges carrying up to 2900 psi steam.
  • One component
  • Low viscosity
  • Chemical resistant
  • Unaffected by thermal cycling
  • Seals flanges carrying up to 2,900 psi steam
  • High strength
  • Service temperature is +100 °F to +1,300 °F (+38 °C to +700˚C)
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Technical Information

Application Temperature -40.0 - 1300.0 °F (-40.0 - 704.0 °C )
Applications For High Temperature Applications
Color Brown
Cure Type Heat Cure
Gap Fill, Unprimed 40.0 mm
Viscosity 48000.0 mPa·s (cP)