Dongan lub tsev ntawv hlau txiav cov vaj huam sib luag sandwich zoo nkauj, yog ib hom khoom siv tshiab rau kev rwb thaiv tsev sab nraud thiab kho kom zoo nkauj, uas tau txais kev nyiam los ntawm ntau thiab ntau tus neeg ua vaj tse. Sab hauv muaj ntau yam khoom siv nrog qhov ceev ceev, xws li pu, eps, pir thiab lwm yam. Qhov saum npoo yog AL-ZN alloy coated steel sheet. Thiab rau kev rwb thaiv tsev, tiv taus hluav taws thiab tiv taus dej noo, cov khoom hauv qab siv cov txheej txheem aluminium foil, uas muaj kev ua tau zoo tshaj plaws ntawm kev rwb thaiv tsev thiab tiv taus dej noo.
