Sound absorption index:pass the GBJ75-1984, GB/T19889.3-2005 test.Average acoustic quantity 37dB(A)~43 dB(A).
Noise absorptivity :pass GB/T20407-2006 test. Average 0.90~0.98
Weather-shield durability :qualified according to JG149-2003\JGJ 144-2004 standard inspection
Fire resistance:achieve A level according to GB/T8626-2006 standard
Impact resistance:according to the A of GB/T14153
Antitypy:pass the GB/T15227
Transmission of light:pass the GB/T2410
Corrosion resistance:pass the GB/T1771-2007
Features:Waterproof and dustproof, beautiful economy, advanced structure, update convenient