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Henkel Adhesive Technologies

Henkel Adhesive Technologies

Gasketing sealants


High strength, heat-cured liquid sealant for high pressure applications

This 1-part heat-cured liquid sealant is designed for threads and flanges. Ideal for high temperature and high pressure applications.

All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.

Part no. (SKU/IDH)

LOCTITE® NS 5540, 1 pt Can



LOCTITE® NS 5540 is a brown, high strength, heat-cured liquid sealant for threads and flanges in high temperature and high pressure applications. The cured product won’t permanently join flanges together, better enabling any future repairs of metal-to-metal joints, and performs well under thermal cycling conditions. It has a top service temperature of 700˚°C (1,300°F) and has been successfully used to seal flanges carrying up to 2900 psi steam. Typical applications include high-temperature thread and flange sealing of steam, oils, hot air, and exhaust gases.

Product category:

Gasketing sealants


Application temperature:

-40.0 °F - 1300.0 °F (-40.0 °C - 704.0 °C)


For high temperature applications



Cure type:

Heat cure

Gap fill, Unprimed:

40.0 mm

Number of components:

1 part

Storage temperature:

8.0 °C - 21.0 °C


48000.0 mPa·s (cP)

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