The world's largest producer and supplier of beryllium and workers exposed to the highly toxic mineral decided not to wait any longer for federal OSHA to draft a proposed worker safety rule on the hazard. Last week, the United Steelworkers International Union and Materion Brush (the only U.S. manufacturer) sent the complete text of a draft regulation to the head of Labor Department's Occupational Health and Safety Administration (OSHA). Individuals exposed to the metal may become immunologically sensitized to it, and develop a unique disabling, chronic lung disease. Beryllium is also…