| 摘要 |
1,258,078. Plasters. B.P.B. INDUSTRIES Ltd. 24 April, 1969 [24 April, 1968], No. 19435/68. Heading C1H. A plaster comprises in per cent b.w. 50-95 hemihydrate of a dry specific surface 2500- 5000 cm.<SP>2</SP>/gm. and a wet dispersed specific surface (defined) of at least 13,800. cm.<SP>2</SP>/gm.; 0-4 hydrated lime; 0-45 ground CaCO 3 ; and 0À05-0À50 cellulose ether. Optionals are animal glue, ground gypsum, citric or tartaric acid, K 2 SO 4 or Al 2 (SO 4 ) 3 , and lime. |
