... alloy frame,covered by fabric. 2. performance of sheep wool wooden acoustic board: Perfect sound absorption and thermal insulation, decoration ... *600*30mm5.Thickness:20mm, 25mm,30mm,50mm6. Flammability:Class A according to ASTM-Class B1 according to DIN4102 ,does not ... , gymnasium, ,school, library, auditorium and so on. 11.Colors: A wide range of colors in woven fabrics12.Installation : Adhesive, Hook ...