... of the board and paper fiber 4.Boric acid 5.Corn starch 6.Foaming agent 7.Glue and adhesive ... MeasuresLength:1800 to 3600mm Width:1200 to 1220mm Thickness:6.4 to 20mm4)Normal Size1830*1220 2400*1200 2440* ... 1200 2700*1200 3000*1200 3600*12005)Normal Thickness6.4,6.5,7.0,9.0,9.5,10, ... ,Smokeproof,easy to be knocked in,easy installation.6)Use in inner decorationCeiling system,Drywall Partion System, ...