... produce all kinds of PVC and aluminum alloy windows and doors.products detail:DOORS:PVC sliding doors, alloy doors, sid-hung doors ... saving doors, heatproof folding doors,WINDOWS:PVC sliding windows, aluminum alloy sliding windows, outside-hung windows, inside-hung windows, ... , tempered glass etcwindows or doors casement material:PVC,aluminum alloy Performance parameters: 1) Sound insulation: RW≥28dB 2 ...