Umnyango womlilo wensimbi engenasici uthatha i-interface ekhethekileyo ye-flanging kunye ne-bite door leaf interface, enenzuzo yesakhiwo esilungileyo, ukumelana nomlilo ophezulu kunye nokuxhathisa okuqinileyo kwe-corrosion. Umnyango womlilo wensimbi engenasici uzaliswe luhlobo olutsha lomlilo kunye nokushisa ukushisa (ibhodi ye-perlite), echasene kakhulu nokushisa okuphezulu.