1.fireproofing, heat preservation, and sound insolation 2.long life(about 30years);lower cost, ... .torages,exhibition halls,gymnasiums,freezing stores and purification workshops (tempkeeping,heat insulation,weight bearing,weatherproof,rich color and good appearance). 2 ... to install, large usage 8.Usage This kind of sandwich panel can be used in steel structure workshop,easy building and ...