... anti-static 2)fireproof,keep warm 3) environmental protection 4)low cost,fast delivery Roof sandwich panelcharacteristics: 1, the quality of ... per square meter of less than 24kg, can reduce the cost of the structure. 2, quick installation of light weight ... used are: rock wool glass fiber, cotton, polystyrene, polyurethane, low thermal conductivity, good thermal insulation effect. 7, environmental noise ...