US: A shortage of alpha- and beta-hemihyrdate gypsum for construction and other applications reportedly ensued ahead of Knauf subsidiary USG's planned closure of its Southard gypsum mine and plant in Oklahoma, scheduled for November 2026. The International Community for Drymix Mortars' Drymix.Info newsletter cited industry sources reporting that customers are reformulating or seeking approvals for alternative sulphate sources.
USG attributed its decision to ‘escalating complexity and cost to mine and manufacture’ the specialised products in its portfolio.
