... thermal insurance,heat protection and sound absorbing materials. Mineral Fiber Ceiling BoardCommon Size:595*595mm,600*600mm,etc Thickness:6 ... -20mm Edge: square,tegular edge Packing: in cartonsMineral Fiber Acoustic ceiling board has RH- 90% ,NRC-0.55 ... thickness Humidity Resistance(RH)>=90%Light reflectivity>=95%Mineral Fiber Ceiling Tiles Fire Performancenon-combustible,reach class A according ...