A mold-resistant gypsum panel includes a core of an interlocking matrix of calcium
sulfate dihydrate crystals, a facing material on at least one side of the panel
and a salt of pyrithione dispersed through both the core and the facing materials.
A method of making a mold-resistant gypsum product is also provided. A slurry of
calcined gypsum, water and a water-soluble pyrithione salt is formed, then deposited
on a sheet of facing material. The slurry on the facing material is shaped into
a panel and maintained under conditions sufficient for the calcined gypsum to react
with the water to form a core comprising an interlocking matrix of set gypsum crystals.
Heating of the panel causes evaporation of the water that did not react with the
calcined gypsum.
