一种新型的建筑材料——α型高强石膏于1985年12月29日在银川通过鉴定。α型高强石膏的最大特点就是强度高、质地细,经济效益和社会效益好。以制作陶瓷行业的模具为例:过去我国都是采用普通的β型石膏制做陶瓷模具。全国有大小二千九百多家陶瓷厂,每年石膏用量约在15到18万吨之间。而 A new type of building material, α-type high-strength gypsum, was certified in Yinchuan on December 29, 1985. The greatest feature of α-type high-strength gypsum is high strength, fine texture, and good economic and social benefits. Take the mold of the ceramic industry as an example: In the past, China used ordinary β-gypsum to make ceramic molds. There are more than 2,900 ceramics factories in the country, and the amount of gypsum used is between 15 and 180,000 tons per year. and