| 摘要 |
PURPOSE:To produce a gypsum plaster board with II-anhydrous gypsum as principal starting material under no restriction by the kind of a hardening accelerator used and the amt. of the accelerator added. CONSTITUTION:When II-anhydrous gypsum is blended with a hardening accelerator, a thickener, fibers, etc., and the resulting blend is extrusion-molded to produce a high strength. gypsum plaster board, hydroxymethylcellulose is used as the thickener. |
