Firemac FM Blue is tested Firemac FM Blue walls, ceilings, ductwork and services enclosures have been tested to BS 476 (Parts 20, 22, and 24), EN 1364-1, BS EN 1364-2, and UL 263, and offers up to four hours' fire protection. It also satisfies the performance requirements of BS 5234-2 for severe duty and the maximum crowd pressure rating (3 kN/m).