Sound-absorbing,Decorative,Flame retardant,Light weight: 229kg/m3, 2.07kg/m2. 1. FeaturePolyester fiber acoustic board combined with a variety of strengths and ... -absorbing mechanism, creating an excellent thermal insulation properties4) Flame retardant: polyester fiber fireproofing material, excellent fire retardant properties, fire protection is class B15)Environmental protection ...