skip to Main Content

R330World’s first UL approval for steel fire protection coating > ratings 240 minutes

Rudolf Hensel GmbH, as the world’s first manufacturer of reactive steel fire protection coating systems, exceeded the American market requirement of up to 4 hours by an additional 90 minutes according to the UL263 standard. The April 2018 test aimed at extending the already existing UL approval for the product HENSOTHERM® 490 KS with additional steel sections and longer fire resistance times. Also tested was a heavy wide-flange section type W up to a critical steel temperature of T = 538 °C / 1,000 °F. As the duration of a fire test progresses, the nature of the insulating foam layer tends to change, the foam erodes and becomes unstable, which results in accelerated critical temperature failure. The present fire test was only completed after 5.5 hours with a very stable, adherent and closed foam layer (see photo) and thus confirms the 4 hour fire resistance time achieved in 2015 with a 3-sided beam test of this steel fire protection coating.


  • Classified according to UL263, Fire Tests of Building Construction and Materials,
    Fire Resistance Directory R27201
  • CoC certificate number: 20130531-R27201
  • Suitable for off-site/workshop application
  • LEED v4, AgBB tested, emission class A+
  • IBU environmental product declaration No. EPD-RHG-20160139-IAA1-DE
  • UL environmental product declaration No. 4787852008.101.1

Further information on the product can be found on our website at
If you have any questions, please contact us by e-mail at

Over to HENSOTHERM® 490 KS
Back To Top