A slurry is made including water, at least 50% by weight calcium sulfate
hemihydrate, and a specific polycarboxylate dispersant prepared using at
least three repeating units. A first repeating unit is a vinyl ether-type
repeating unit. A second repeating unit includes a maleic acid-type
repeating unit. A third repeating unit includes an acrylic acid-type
repeating unit. The polymer dispersant has a molecular weight of from
about 20,000 to about 80,000 Daltons. The slurry made from this
composition can be made at reduced water levels to speed drying and
reduce drying costs.