EFFECT OF GROG ADDITIONS ON FIRE RESISTANCE OF HOLLOW TILE 1

This paper mentions the general character of the investigation of the fire resistance of hollow tile and gives the results of only one phase of the work. A brief description of the test apparatus and the test method is given. Tests of three kinds of tile containing varying amounts of grog additions are described. These panels withstood the test for periods ranging from 20 minutes to six hours or more, the time varying indirectly with the grog content. It is concluded that the small grog additions which can be conveniently made in manufacturing practice have no effect, but that additions of five per cent or more will materially decrease the fire resistance of hollow tile.