... a classic quality product,workmanship and unique formula 1,Material:mineral fiber sound insulation board2,Surface:Avariety of surface patterns available.3 ... :≥90%7,Fire ferformance : meet CNS6532 CLASS 18,Product content: Mineral fiber 9,Thermal conductivity≤0.065w/mk10,Bending strength:>250N11,Noise ... :10mm,12mm,14mm.15mm.18mm.Mini order :1*20ft ceiling board