... product. This product is compounded from fine, soft glass fiber through high-pressure heating. It has excellent properties of heat ... the sound insulation for roof.Standard Specification capacityKg/m310,12,14,16,20,24,32thicknessmm25,30,40,50,75 ... .048≥ 3502832± 3effect of sound insulation(non-veneer glass fiber felt) capacitythicknesscenter frequency(Hz)125250500100020004000NRC16250.120.280.730.890.920 ...