Alginate Dental Impression Materials Grade Calcium Sulfate Gypsum Powder - JingmenLeixinGypsum ( China ) - Offers to Sell and Export - Monday 17 August 2015 1:42 am - alginate dental impression materials grade calcium sulfate gypsum powder there are two subtypes and they completely meet gb1892 2007 food additive calcium sulphate standard with directly enter human body safe and non toxic...