valuvormi kohtpurunemisest tingitud pinnadefekt - vormimaterjali sisaldav pinnast väljaulatuv osa, a defect of the surface of casting that appears as a rough, slightly raised surface blemish, crusted over by a thin porous layer of metal, under which is a honeycomb or cavity that usually contains layer of sand; defect common to thin-walled portions of casting or around hot areas of the mold