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Malhotra, H.L., 1961. FIRE RESISTANCE OF PERFORATED BRICK WALLS. Fire Research Notes 463
Fire tests have been performed on loadbearing walls made from three types of perforated bricks developed by the Building Research Station. Without any plaster walls of any type of brick had a fire resistance of the 1 hour grade and by using the appropriate plaster the fire resistance of the walls was increased to 4 hours.