Rockwool Sandwich Wall Panel, PU Sandwich Roof Panel, Construction Material manufacturer / supplier in China, offering Fireproof B1 Grade Metal Sheer PIR/PUR/PU/Polyurethane Sandwich Panels for Steel Structure Building /Warehouse/Office/Factory Wall and Roof, Q355b En10025 Beam/Column Welded Technology for Prefab House/ Steel Structure/ Building Materials, Metal Steel Structure for Watchhouse with Sandwich Panel Beam Tube and so on.