Many fire tests have been developed to evaluate the flammability performance of lining materials. According to the test methods, specimens are traditionally mounted vertically as a wall or horizontally as a floor. The only exception is the ISO 9705 room corner test in which ceiling material is installed beneath a ceiling. This study was accordingly designed to discuss the test results of ceiling materials in the ISO 9705 room corner test with the testing capacity of the traditional tests to evaluate the feasibility of the traditional tests to rank materials mounted beneath a ceiling. Materials used were gypsum board and particle board, which are ranked the best and the worst classes by the cone calorimeter, a commonly used testing apparatus. Our results showed that the fire behaviors cannot completely perform those tested in the ISO 9705 room corner test. A penetration occurred in the gypsum test and led to a severe fire although flashover was not observed. The results from the traditional tests are obtained from tests that are primarily concerned of the potential of a material leading to flashover. The penetration of flames through ceiling materials cannot be assessed in the other tests. A modification of the traditional test is recommended when ceiling materials are tested.

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