-calcium silicate board -fiber reinforced cement board -waterproof -fireproof -ideal ceiling and wall partition material Product technical parameters Specifications and appearance Thickness specifications 6,7,8,9,10,12,15,18,20mm Standard 2440×1220mm Basic error Length and width:±/3mm thickness:±/0.2mm Edge straightness:<2mm/m Diagonal line the maximum error:≤5mm appearance Right Angle,aren horn, ...