valu tuliseid (tulepüsivaid materjale) sisaldavates kipsvormides, millistes kipsi ja valuvormi tugevdava armatuuri kaaluline vahekord on umbes 80/20; kasutusel peamiselt Al- ja Cu-sulamitest valandite tootmisel (vt kipsvormvalu), a version of plaster mold casting process which utilizes conventional, reusable patterns while the plaster formulation consists of approximately an 80/20 weight ratio of gypsum to fibrous mineral; used for production of Al- and Cu- alloy castings (see: plaster mold casting)