... soft surface 3.high efficient noise insulation wave noise absorbing sponge effect is good, function FR,Rohs,svhc Uses ... according to customer requirementsSizeProduction according to customer drawings featureSound-absorbing effect is good, functionFR,Rohs,svhcUsesNoise reductionIndustry StandardGB,BS ... air friction and pore walls, so that a considerable part of the sound energy into heat energy has been ...