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2. The main composition ofgypsumis dehydrategypsum﹙ CaSO 4.2H 2 O ﹚.However, thegypsumpowder used in practical production (such as thegypsumpowder forgypsumboard, for mould, for plastering) is to dry and dewater the dehydrategypsum, reduce the content of crystallization water in it, so the standard of crystallization ofgypsumpowder can meet the needs of all kinds ofgypsum