Making Plaster Of Paris From Gypsum

16.06.2008· i am tring to make plaster of paris from gypsum following directions to heat the gypsum in the oven to 160 cel heat gypsum in the oven for 40 minutes at 160 celcius, after cooling mix with water and see if it sets.my problem is that it's not setting, can anyone tell me what i might be doing wrong?

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