A gypsum board composed of light weight comprises a low density foam powder core, a high density non foam adhesive layer (or low foam) and a low density non foam (or low foam) adhesive layer, One cover surface, mixed with low density foam core on high density non foam Alliance (or low foam), mixed with low density foam slurry core, one cover surface, mixed with low density pO low foam (or low foam) alliance high density layer. High density adhesives for low density powder foam cores and non Foam Adhesives (or low foam) are made of gypsum slurry including gypsumAccording to the weight of gypsum, the weight of the pre coagulated starch in the bathtub is about 0.5-10%. It is better to take the weight of gypsum as the weight of nanophene sulfuric acid powder, preferably sodium triphosphate, with the content of about 0.12-0.4%. According to the weight of gypsum. Other dairy additives may include accelerators, adhesives, paper fibers,Fiberglass and other known ingredients. The low density powder foam core has a preparation density of less than 30 lbs / skin 3, using soap foam in the mud containing gypsum. The combination of components provides a composite gypsum board with light weight and high strength. The method of making composite gypsum board is also provided.
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