polyester train acoustic insulation batts

polyester train acoustic insulation batts 1. 100% recyclable and environment-friendly; 2. High sound absorption index and excellent acoustic insulation. Polyester Fiber Cotton is a porous material and its special structure makes sound flow back in the cavity, which insulates the sound effectively. Sound absorption index is up to 0.94 when the noise range between 125-4000HZ; 3. Excellent thermal insulation increases the effective of energy, and therefore save energy for you; 4. The material can easily be cut with ordinary knife; 5. Longevity: 50 years long 6. Not to be decayed, resistant to microbes, fungi, insects, acid, etc; 7. No odor, no formaldehyde (HCHO) or any other toxic substance; No protection needed in deformed; 8. Water-proof, even after being soaked, its sound behavior wont decrease and it wont go deformed; 9. Quite light weight. About10kg each cubic meter, 2000g each sq. meter;10. Perfect stability of physical property that it is difficult to be changed by water and fire