Winstone Wallboards is the major bulk importer of high purity Australian mineral Gypsum in New Zealand. The Gypsum is used primarily for the manufacture of GIB® plasterboard. Winstone Gypsum is a division of Winstone Wallboards created in 1994. Winstone Gypsum is focussed on marketing Gypsum products in ground and screened form into the Horticultural, Agricultural and other alternative industrial markets. A nationwide distribution network has been established in New Zealand.