... , polystyrene and other light, fire, flame-retardant material of the core layer of new building materials, with light, heat good, sound absorption and good ... , can be flexibly used in any construction. Quality Characteristics: 1, light weight, 10-14 kg / square meter, very walls of 1 ... (mm): wall 1200,1150,950 Roof 950 4, the average sound volume: Thickness(mm)5075100150R(dB)20.0021.5023.0024.50 ...