The Occupational Safety and Health Adminstration cited Imperial Sugar nearly six months later for 108 "willful violations" related to combustibledust at the Port Wentworth, Ga.
Apple said it has established new requirements for firms dealing with combustibledust after the blast in Chengdu and an explosion at another supplier's factory in Shanghai that injured 59.
The House passed legislation two years ago that would force OSHA to quickly issue rules regulating combustible industrial dust, but the proposal stalled in the Senate.
In spite of renewed calls for regulatory measures, OSHA's Mr. Barab said it will be years before the agency settles on a new combustible-dust standard, a key regulatory measure recommended by the U.S. Chemical Safety Board, a separate government agency.