Ingaphezulu lengxubevange ye-aluminium inefilimu yokwenziwa ye-oxide, enombala ukuze yakhe ifilimu eyinhlanganisela. Ifilimu ehlanganisiwe ayigcini nje ukumelana nokugqwala nokungqubuzana, kodwa futhi inokumelana okuthile nomlilo, ngakho-ke yenziwa umnyango womlilo we-aluminium alloy. Umnyango womlilo unamandla aphezulu aguquguqukayo kanye nokuguqulwa okuncane.