| 摘要 |
The product containing set gypsum having increased resistance to permanent deformation is according to the invention prepared from a composition comprising the following items: calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from the group: sodium trimetaphosphate, sodium hexametaphosphate, tetra potassium pyrophosphate, aluminium trimetaphosphate, acid sodium pyrophosphate, ammonium polyphosphate and polyphosphoric acid with 2 or more repetitious units of phosphoric acid. The invention also provides a method and compositions for production of the protected product. |
