Hon Hai, the parent corporation of Foxconn, has announced the closure of all their polishing workshops pending inspections, lending credence to the government task force theory that combustible dust was ignited, sparking an explosion on Friday at the company's Chengdu plant that killed a total of three workers and injured many others. The polishing process, one of the last stages of product assembly, is used to polish Apple's iPad cases and other electronic parts for other companies, creating fine dust of various elements such as aluminum, which is highly combustible
