... , ≤8%; Ash content, ≤10%; MgO, ≤5%. (2). Gypsum: dihydrate plaster stone or phosphogypsum, sulphur trioxide content, ≥35%. (3 ... m3;(2). Proportion: cement, 8%; Quicklime, 19%; sand, 70%; Gypsum, 3%; aluminium powder, 450g/m3; addictives: 400g/m3. (3 ... products:Body of bearing wall and nonbearing wall, multifloor (less than 6 floor) bearing wall blocks, insulating blocks and wallboard. 45 kinds ...