Cafco SPRAYFILM® WB3 is a water based intumescent coating consisting of polyvinyl acetate resins and fillers for the fire protection of structural steel. It can be sealed and protected with a decorative top coat.

Cafco SPRAYFILM® WB3 is applied directly to the contour of primed I and H-section columns, angles, channels and beams, and hollow sections, to provide fire protection for up to 120 minutes. In a fire, a chemical reaction takes place, causing the Cafco SPRAYFILM® WB3 to expand and form an insulating layer which prevents the temperature of the steel rising above a critical level.


  • Provides fire resistance for up to 120 minutes in accordance with BS 476: Part 21 and up to 180 minutes in accordance with ASTM E119, NFPA 251, AS 1530: Part 4 and AS 4100
  • Durable and decorative finish
  • Steelwork may be left exposed to view
  • Chemical and abuse resistant
  • Can be top coated to match surroundings
  • Easy application and clean up with water
  • Fast drying time.



The product is suitable for internal and external use for fire protection of steel structures.