kergsulavast gasifitseeruvast või lahustuvast materjalist ühekordse kasutusega valumudel (vt valumudel, täppisvalu, gaasistuvmudelvalu), a pattern that is destroyed in making a casting which it is usually made of wax (investment casting) or expanded polystyrene (lost foam casting/evaporative pattern casting) (see: pattern, investment casting, evaporative pattern casting)