... 2)fireproof,keep warm 3) environmental protection 4)low cost,fast delivery Roof sandwich panelcharacteristics: 1, the ... fiber, cotton, polystyrene, polyurethane, low thermal conductivity, good thermal insulation effect. 7, environmental noise prevention, composite board insulation strength ... to meet the special design needs. 9, high strength with high strength steel plate as a substrate, the tensile ...