Dust collection expert Robert Williamson at Nederman Corporation, commented on a video of the deadly explosions at Horizon Biofuels, in Fremont, Nebraska. “It’s only speculation at this point, but it is these types of [wood dust explosive] events where we see fatalities,” said Williamson, VP Technical Solutions and Business Development North America. “You have the primary explosion and then a bigger explosion, the whole elevator explodes, and part of the building.” After the primary event, fine dust, which is more reactive than heavier dust and tends to accumulate in hard-to-clean areas, causes a secondary explosion, which experts on the scene also believe was the case in this instance. …Wood dust explosions can happen so fast that there is no time to evacuate. “These things happen so quickly, in less than 500 milliseconds,” he said, “There’s really no way to get away. Nobody’s going to run from this.”