Wallmate CW Boards
Wallmate CW Boards contain a flame retardant additive to inhibit accidental ignition from a small fire source. The boards are, however, combustible and, if exposed to an intense fire, may burn rapidly. All fire classifications given in Dow literature on Wallmate CW insulation boards are based on small scale tests and may not reflect the reaction of the material under actual fire conditions.
Additional useful information on aspects of fire performance of extruded polystyrene in building applications is listed in BS 6203: 1989; Fire Characteristics and Fire Performance of Expanded Polystyrene Materials used in Building Applications.