Abstract: Employee #1 was using an angle-head grinder on a steel camera platform in a metal fabrication and welding shop. The sparks from this process ignited aluminum dust in the dual bag dust collector, model UFO 102, that was approximately 6 to 8 ft away. Employee #2, who was doing some layout work across the room from Employee #1, came over and clapped the burning bag between his hands to stop the fire. Instead, the bag exploded and the aluminum dust flashed. Employee #1 suffered burns to his right arm; Employee #2 sustained burns on his face, both arms, stomach, and knee, for which he was hospitalized. The coworker should have used a fire extinguisher on the burning bag.