| 摘要 |
Plaster based compsn. consisting of a major proportion of plaster and a minor proportion fo a mixt. contg. a porophore and a hardening agent is claimed in which oxalic acid is used porophore and/or as hardener, in an amt. 3-15 (5-10) wt.% w.r.t. the plaster. The porophore and the hardener can be one material. |
