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Water Based Intumescent Coating

Cafco SPRAYFILM® WB3 is a water based intumescent coating consisting of polyvinyl acetate resins and fillers for the fire protection of structural steel. It is preferably spray applied with airless paint equipment for speed and quality of finish. Brush and roller application is also possible.

Cafco SPRAYFILM® WB3 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 both square and circular 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 slows the temperature of the steel rising to a critical level.


Fire resistance Steel structures protected with Cafco SPRAYFILM® WB3 have undergone fire resistance tests up to 120 minutes in approved independent laboratories to recognised standards throughout the world, including:

  • Australia (AS 1530: Part 4: 2005)
  • UK (BS 476: Part 21: 1987)
  • Canada and USA (ASTM E84 and E119: 1998)

Fire resistance test results are assessed in accordance with ASFP “Fire protection for structural steel in buildings” procedures. If UL certification is required, please consult Promat.

Surface burning (ASTM E84: 1998) Flame spread 5, smoke development 35
Alkalinity pH 8.0 ± 0.2 at 25°C
Theoretical coverage Approximately 18.79m² per container at 0.7mm DFT
Practical coverage Dependent on surface texture, substrate, application method and technique.
Number of coats One or more as required
Maximum thickness (WFT) per coat mm 1.6 using spray 0.76 using brush For airless spraying, several thin coats as opposed to one heavy coat will give greater control over finish and thickness.
Cure By air drying
Initial set at 20°C, 50% RH and 0.4mm WFT Approximately 6 hours
Density kg/litre 1.33
Solids by weight 70% ± 2%
Impact resistance (ASTM D2794: 1993-2010) kg/m 18
Durometer hardness (ASTM D2240: 2005-2010) 80 shore D
Abrasion resistance at 1000 cycles (ASTM D4060: 1995) g 0.6505
Colour and texture condition White with a flat matt finish