The effect of the special pipe/duct soundproof material:?The Sound-absorbing sponge and sound-absorbing carpets absorb the underwater sound and impulsive sound from the pipe/duct.PVC or EVA is high proportion, flame retardant material, Plays a role of noise barriers,In addition to cut off the noise caused by water and impact in further,it also good looking ,Eco-friendly,fire resistance,aging proof, long service life,can Prevent bacterial breeding in dark place, convenient to construction.the material has been fixed-scale cutting according to the pipe outer diameter and had 2.5 cm interface, not only a good sound insulation effect and convenient in constructionSpecification:?Thickness:27mm size：1000mmx5000mmx27mm.can be customizedMaterials：25mm Wave Acoustic Sponge+ 2mm soundproofing materials+0.1mm Alu foil-faced.?Usage:Used to wrap noisy pipes, ducts, valves and fan housings?Soundproof products made 25mm sound absorbing sponge, combine with ......url:http://www.goodsoundproof.com