... 2.soft surface 3.high efficient noise insulation wave sound 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-5852 or TB117MakerDaye Tengfei Sponge/foam when the sound waves incident into it, it can cause gaps ...