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Articles, including fiberboard, are made from a pumpable, flowable slurry including alpha-calcined calcium sulfate hemihydrate anchored in pores of host particles, alpha-calcined calcium sulfate hemihydrate, a silicone compound, magnesium oxide, and water. The magnesium oxide catalyzes the reaction of the silicone compound into a silicone resin. In a preferred method of making a water resistant fiberboard calcium sulfate dihydrate is combined with the host particles and water to form a slurry which is heated under pressure to calcine the calcium sulfate dihydrate to form alpha-calcined calcium sulfate hemihydrate. After relieving the pressure, a silicone compound and magnesium oxide are added to the slurry. The slurry is dewatered to form a filter cake, which is then formed into a desired shape and allowed to set.

A preparation method of a carbon aerogel thermal insulation material comprises the steps as follows: 1) preparing phenolic prepolymer sol with an acid-base two-step method; 2) preparing organic gel with a solvothermal method; 3) preparing organic aerogel with a normal-pressure drying technology; 4) preparing carbon aerogel with a carbonization cracking technology. Linear phenolic molecules are linked and woven into an isotropic 3D network structure with hexamethylene tetramine as a crosslinking point on the nanoscale with the acid-base two-step method which firstly adopts acid catalysis and then alkaline crosslinking, the framework strength is improved, and the crosslinking degree and uniformity of the framework structure are increased. By the aid of the solvothermal method, the gel polymerization reaction is accelerated, the technological period is shortened, and the gel polymerization reaction is fully conducted, so that the crosslinking degree and strength of the nano network framework are enhanced. The method is simple, efficient and low in cost, the problems of long preparation period and high cost of traditional technologies and higher shrinkage in a normal-pressure drying technology are solved, and the obtained carbon aerogel thermal insulation material has high mechanical strength and low heat conductivity.