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High Quality 50mm/75mm/100mm/120mm Polyurethane/PU/PIR Wall and Proof Sandwich Panel for Cold Room and Steel Structure, Find Details and Price about Sandwich Panel Sandwich Wall Panel from High Quality 50mm/75mm/100mm/120mm Polyurethane/PU/PIR Wall and Proof Sandwich Panel for Cold Room and Steel Structure - Qingdao Global Span International Engineering Co., Ltd.