Armstrong Cortega Mineral Board Tegular 600mm x 600mm Technical Details- • Size: 600mm × 600mm • Quantity: 16 • Sound absorption alpha w: 0.55 (H) • Sound absorption (NRC): 0.55 •Sound attenuation Dncw (dB): 34 • Light reflectance (%): 80 • Humidity resistance (%RH): 70 • Thermal conductivity (W/m°C): 0.0562 • Fire reaction: Class 0 / Class 1 (BS 476) • Weight (kg/m2): 3.5