The formation tool null which makes the formation item which consists of the concrete and the mortar compound which include the plastic material or

摘要

The mold body of at least one casting mold (1, 2) of this form tool is provided with a core (3, 4) of porous artificial resin concrete or mortar which is permeable through to the mold surface (5, 6) and a jacket (7, 8) which encloses the core on the outside in a gas tight manner. The jacket has at least one passage (9, 10), which allows an exchange of gas and/or liquid from and to the mold surface (5, 6). Form tools with porous form bodies of this type are suitable for processing gas and/or liquid-containing mold materials. Furthermore, they can be used for processing without difficulty chemically hardenable mold materials, for example polymers and polymer concretes or mortars by the utilization of separating foils which are applied to the mold surfaces by an underpressure in the mold body and which are held against this.