NOFIRNO mineral boards offer a very economic solution for the sealing of larger open spaces in conduit openings.

NOFIRNO boards have been successfully tested during a 90 min fire test according to the European standard EN 1366-3:2004 (determination of the fire resistance of a cable penetration through an aerated concrete wall).

Mineral wool boards

Are coated with a layer of NOFIRNO on one or both sides. In case of fire the NOFIRNO coating will form a ceramic protective shield at the exposed side. This shield is also a thermal barrier.

Furthermore it prevents moisture from escaping from the inside of the mineral wool board so that no shrinkage will occur during fire exposure. NOFIRNO coating is water resistant.

Application aresas:

  • Building and constructions
  • RenovationTransport industry
  • Utilities works
  • Telecom and IT industry


  • Designed to provide a fire safe sealing solution for upgrading existing installations
  • Combination of ACTIFOAM® rubber and NOFIRNO® boards, especially for oversized penetrations
  • Cellular rubber with closed cell structure to prevent moisture absorption
  • Rubber is activated and expanding when exposed to flames or extensive heat
  • NOFIRNO® coating prevents shrinking of mineral wool board. Not moisture sensitive
  • Breakthrough – coating which forms a ceramic shield when exposed to fire, preventing shrinkage
  • The system of choice for replacing intumescent sealing systems