... aging, anti-frozen, excellent sound absorption, anti-humidity, exceptional salt tolerance,etc. Technical specifications:1,sound absorption coefficient: NRC≥0.65 ... other and attentuates so as to reach effect of sound absorption.Product specification:Thickness: 1.3mmWidth: 1000mm, or ... viaduct, railway, airport, etc.2,As anti-reflection sound absorbing wall panel &ceiling panel in meeting centre, ...