Sound-absorbing cotton and cotton insulation is actually not the same, sound-absorbing cotton is mainly used a silencer, silencer process will sound energy into heat energy, cotton insulation is to block sound transmission, the disadvantage is prone to sound energy reflection. If good quality insulation materials, can play a good sound effects, but also destroyed the noise is a good example of a density gradient absorbent cotton is a ladder-type material, with a lot of holes between the holes are interconnected If there is noise from entering the post will collide with the material and friction, and ultimately weaken the sound energy purposes. If attached to the glass insulation cotton basic can achieve better sound insulation. Absorbing cotton can be divided into two types, the first sound-absorbing cotton polyester fiber, glass fiber second is absorbing cotton, sound-absorbing effect of the common products in basically the same, but the difference between fiberglass environmental protection, and will feel if contact with skin to itch, the construction is very convenient. Disadvantages ordinary polyester fiber is poor fire performance, or do not have any fire safety features, once the fire accident consequences will be very serious. So when buying a cotton must be practical options and purchase the actual situation, if it is more closed places such as underground karaoke can not use sound-absorbing cotton polyester fiber, otherwise the chance of fire escape will be very small. The gradient absorbing cotton is imported polyester fiber cotton insulation improvements important process after it avoids the possibility of general environmental noise cotton prone to fire. In actual testing in the National Fire Equipment Quality Inspection Center, the gradient of sound-absorbing cotton flame retardant industry are strong, its combustion performance is B1 level, is entirely up to our public spaces, indoor decoration noise level of fire safety. Acoustics sound-absorbing cotton gradient but not comparable to similar products, its acoustic efficiency is particularly high, due to its special lamination step density after treatment, the formation of various frequency noise while absorbing features excellent acoustics, Tongji University Institute of Acoustics The obtained result of the detection is: 5cm thick sound absorbing material health products, integrated noise reduction coefficient of 0.90 can be achieved by varying the density and thickness, which can further enhance the sound absorbing performance in practical applications. 

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