... -static 2)fireproof,keep warm 3) environmental protection 4)low cost,fast delivery Roof sandwich panelcharacteristics: 1, the quality ... used are: rock wool glass fiber, cotton, polystyrene, polyurethane, low thermal conductivity, good thermal insulation effect. 7, environmental noise ... plasticity sheet steel can be cut, enough to meet the special design needs. 9, high strength with high strength steel ...