... high-pressure heating. It has excellent properties of heat insulation, sound insulation, wear resistance, easy construction and so on. ... and civil walls, roof, as well as the sound insulation for roof.Standard Specification capacityKg/m310,12,14,16 ... 220≤ 0.05324≤ 0.048≥ 3502832± 3effect of sound insulation(non-veneer glass fiber felt) capacitythicknesscenter frequency(Hz)125250500100020004000NRC16250. ...