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In reply to the discussion: 2 dead, at least 9 unaccounted for after explosion rocks Pennsylvania chocolate factory [View all]Farmer-Rick
(10,135 posts)Those dusts are very flammable and if proper safety procedures or ventilation are not functioning, it can lead to explosions.
There was a 2015 KY sugar dust fire "Northern Kentucky firefighters battled a large fire at the Perfetti Van Melle USA factory in Erlanger on Friday morning." https://www.wcpo.com/news/local-news/kenton-county/erlanger/fire-breaks-out-at-perfetti-van-melle-factory-in-erlanger
There are cocoa dust fires too. https://www.wcpo.com/news/local-news/kenton-county/erlanger/fire-breaks-out-at-perfetti-van-melle-factory-in-erlanger
That was an Illinois 2018 chocolate cake mix fire started by a spark from a fan.
You don't think about how foods can be flammable but I suspect most any dust allowed to accumulate to excess levels could be flammable, except for maybe Asbestosis.