Polyurethane ua npuas ncauj sandwich phab ntsa vaj huam sib luag (16 hli) yog ib yam khoom tshiab nrov rau rwb thaiv tsev.Nws tuaj yeem siv rau hauv cov tsev tshiab thiab qub.Nws yog firproof, rwb thaiv tsev kub thiab cov khoom zoo nkauj zoo nkauj rau lub tsev.
Lub vaj huam sib luag no muaj peb txheej txheej pem hauv ntej yog embossed xim coated galvalume steel ntawv, cov khoom siv tseem ceeb yog tawv polyurethane foaming (rau rwb thaiv tsev), sab nraub qaum yog aluminium ntawv ci, peb txheej yog zoo li tus tsim los ntawm industrialized.