This paper is intended to study on combustibility of the cellular plastics insulation material, and the following points were examined.
1. Obtaining a quantitative knowledge on combustibility of various cellular plastics insulation material by cone calorimeter method.
2. Clarifying necessary information on the cellular plastics insulation material for the cause pursuit when there is a difference like combustibility.
In conclusion, the following knowledge is obtained for this study.
1. In the same cellular plastics insulation, the total heat release for each unit mass was roughly constant. However combustibility might be different because of the process of burning, and it is thought that the material composition of the cellular plastics insulation takes part as the cause.
2. In cellular plastics insulation except rigid urethane foam, the grasp of combustibility is roughly possible by considering information on the material composition from MSDS and information on thermal behavior from document.
3. In rigid urethane foam, to understand combustibility in detail, it is necessary to clarify the factor that contributes to combustibility. Result of examination, the nurate index and the kind of the foaming agent contribute as the factor.

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