Isover Protect BSF Intumescent Paint

A highly thixotropic paint in a water-based dispersion for use with the ISOVER U Protect system for the passive fire protection of circular and rectangular ductwork. When exposed to fire or heat, Protect BSF develops a microporous, insulating foam layer, protecting surfaces/areas from the influence of fire due to its low heat conductivity and the lack of oxygen.

Features and benefits

  • Can be applied with a brush, roller or spatula
  • Processing temperature between 5°C and 30°C 
  • Touch dry after 4 hours and completely dry after 24 to 48 hours
  • Solvent free, pH neutral, white, water-based dispersion. Free of Volatile Organic Compounds (VOCs)
  • Classified according to Regulation (EC) No 1272/2008: Protect BSF is not classified according to CLP regulation

Product code : 04FZPI

Associated products


Fire rating

ISOVER Protect BSF Intumescent Paint has been tested as part of the ISOVER U Protect passive fire protection system under EN 1366-1 and EN 1366-8 and assessed against BS 476: Part 24. The ISOVER U Protect system offers up to 2 hours passive fire protection in HVAC ventilation and smoke extract ducts, as well as 1 hour passive fire protection for kitchen ducts.

The fire resistance is dependent on the application, the thicknesses of insulation used and the method of installation. The fire performance of the system cannot be substantiated if alternative components are substituted. Please refer to the U Protect Installation Guide for further details.