... sound absorption, shock absorption, insulation, flame resistan Glass fiber pocket bags have advantages of a high temperature, corrosion resistance, ... filtering speed, sound absorption, shock absorption, insulation, flame resistance, folding resistance and so on.specificationCMN-FEMN-Fweight: g/ m29501000air permeability ... treatmentPTFE (Ptfe treatment)PTFE (Ptfe treatment) Glass fiber pocket bags