... no asbestos; no formaldehyde; best fireproof; best water resistance MgO board/ Magnesium Oxide Boardsmain material: MgO, MgCl2, non-woven fabrics, fiber glass, sawdust , ... perlite THICKNESS3-12mm, usual thickness:5mm,8mm,10mm,12mmDIMENSIONS1200mm X 2400mmCOLORwhite/gray Density0 ... :>2Hours; 12mm:>4Hours;Thermal Coefficient0.109W/(m.k) MgO board