| 摘要 |
1,223,007. Refractory compositions. CERAMCO INDUSTRIAL PRODUCTS CORP. 3 April, 1968 [3 April, 1967], No. 15954/68. Heading C1J. A medium for use in separating a porcelain prosthesis from a ceramic die comprises a suspension of a refractory powder, not wetted by fused porcelain, in an evaporating vehicle containing in solution a cellulosic ester and, optionally, a lower alkyl acetate, the weight volume ratio of refractory to ester 11À1-14À3 to 1. Specified are refractories: mica, talc, alumina, magnesia; ester: nitrate; vehicle: acetone; and acetate: amyl, butyl or ethyl. |
