Sound insulation, All-weather, UV Stablized Pre-coated Aluminum 100% PU ... D team of China, satisfied clients to have all kinds of colors, tailer-made roller shutter solutions ... QC: We apply AQL (Acceptable Quality Level) into all stages, ranging from IQC (Incoming QC), IPQC ( ... QC) and OQC (Outgoing QC). *Certificate: We manufacture all products according to ISO2001:2000 , TUV quality control guidelines. ...