| 摘要 |
<p>Asbestos can be successfully replaced by cellulosic fibres in the production of asbestos-free, gypsum- based building board by the take-up method provided that the wet pulp used contains 3 to 30% of the dry weight of cellulosic fibres which have been beaten to a degree of 30 to 70 DEG Shopper Riegler, and 70 to 95% of gypsum as the hemihydrate.</p> |
