I-Sub Entry Shroud iyishubhu ye-refractory yokusebenza ephezulu ekhiqizwa inqubo ye-isostatic pressure, eyenzelwe ukulawula ukugeleza kwensimbi encibilikisiwe ukusuka ku-tundish kuya ku-crystallizer, futhi isetshenziswa kabanzi kwinqubo yokuphonsa eqhubekayo embonini yensimbi.
