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Gypsum tiles: perforated gypsum core tilesthickness: minimum 12.5 mm dimension: 600 600 mmlight reflectance: not less than 75% of unpainted tilesThermal conductivity (K value) : .45 W/MKNoise reduction coefficient (NRC) not less than .74Weight : About 9.3 kg/m2Humidity Resistance 95%Burning Characteristics: rated class A perforated gypsum core tiles, gypsum tiels ceiling