Calcium Sulfate Dihydrate → Calcium Sulfate, Hemihydrate

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The decomposition temperature of the inorganic compound hydrate is preferably from 100 to 170° C. When the decomposition temperature is less than 100° C., water due to the decomposition is produced in the early stage of the foaming and curing of the foam raw material, that is, in the stage where exothermic temperature is low. Therefore, there is a possibility that it may have an adverse influence on the foaming and curing of the raw material, or the produced water may function as a blowing agent. Calcium sulfate dihydrate (gypsum dihydrate) loses water at 128° C. to form calcium sulfate hemihydrate (gypsum hemihydrate), wherein 1.5 mol of water in 2 mol of water in the molecule decompose to form free water. Magnesium sulfate heptahydrate loses water at 150° C. to form magnesium sulfate monohydrate, wherein 6 mol of water in 7 mol of water in the molecule decompose to form free water.

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