... 3.Sound-insulation and sound-absorbing 4.Light weight sandwich panel: Filling the heat-insulation material between two pieces of ... decoration. It's made from magnesium oxide, magnesium chloride, fiberglass mesh, sawdust, perlite etc. We use, highly-purified active ... main cementing material to solidify other materials, alkali –resistance fiberglass mesh to ensure the high strength of board, soft sawdust ...