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A 40 lb./ft³ (640 kg/m³) density (average) SFRM intended for the fire protection of structural columns, beams, joists, decks, walls, roofs, girders, floors and pre-cast concrete units. It is tested and certified for fire resistance ratings up to 4 hours. It was specifically formulated for high humidity areas such as mechanical rooms, elevator shafts and parking garages and is resistant to damage and moisture. Southwest Type 7HD is a trademark of the Southwest Fireproofing Products Company.