Ultralight, eco-friendly, non-aging, anti-frozen, excellent sound absorption, anti-humidity, exceptional salt tolerance,etc. Technical specifications:1,sound absorption coefficient: NRC≥0.65( with 75mm air space)2,soundproofing coefficient: ≥30dB(A)3,salt tolerance and corrosion resistance4,Breaking Load: ≥1305NProduct description:Enormous quadrihedron-like holes are spreaded on both sides., and ...