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SteelMaster 900WF is a one component waterborne acrylic thin film intumescent coating. Independently approved for fire protection of structural steel exposed to cellulosic fire. It can be used as mid coat or finish coat in atmospheric environments. The declared product is specially designed as a reactive fire protection system for steel constructions. It is designed to protect for up to 120 minutes on a wide range of I section beams, columns and hollows. It is fire tested and approved to BS 476 part 20/21. SteelMaster 900WF is suitable on approved primers on carbon steel substrates and for structural steel exposed to internal environments.