Abstract: Employees #1 through #4 were in a lab in Canton, OH, where they were conducting a test that involved opening air freshener aerosol cans to inspect them for internal liners. The aerosol cans contained 99.5 percent liquefied petroleum gases (propane and isobutane). Employees #1 through #4 would punch a small hole into the top of each can to vent the pressure and then cut open the can and pour the liquefied gases into a 2 1/2 to 3 gal bucket. The full bucket was emptied twice into a lab sink with the hot water running. Approximately 400 to 500 12 oz cans had been emptied into the sink when the accumulated liquefied gases ignited and exploded. Employees #1, #3, and #4 were killed; Employee #2 required hospitalization.