1.fireproofing, heat preservation, and sound insolation 2.long life(about 30years);lower cost,convenient ... Composed of 2 layers of weather proof colored steel sheet and jetted hard forms of polyurethane between 2 laye (fireproof ... size factorybuildings, 1-3.torages,exhibition halls,gymnasiums,freezing stores and purification workshops (tempkeeping,heat insulation,weight bearing,weatherproof,rich ...