A method comprising adding a suspension of a hydrophobic substance to a
gypsum slurry. The hydrophobic substance may impart water repellent
characteristics to the gypsum, may be used as a foaming aid, density
reducer, dimension stabilizer, and others, and may increase the
mechanical strength and durability of the gypsum product. In another
embodiment of the present invention, suspensions of other substances may
be used in addition to or in place of the hydrophobic substance to impart
these characteristics.
