The USCSB (US Chemical Safety and Hazard Investigation Board) has released a video on combustible dust hazards - which varies from resin, rubber dust, nylon fiber, sugar, coal to aluminum. The video has some helpful animations showing the cause of the aluminum dust explosion. The video contains some adult discussion about fatalities parents should review this to determine if it is appropriate for children.
Dust explosions require the fire triangle of fuel, oxygen and ignition plus dispersion and confinement. A dust layer as thick as a dime (1/32 inch or 0.7938 mm) covering 5% of a room surface area is sufficient to cause and explosion. Dust on suspended ceilings can often cause the problem because it is not visible.
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| http://explosionproofvacuums.com/why-explosion-proof/combustible-dust-resources/66-osha-combustible-dust-chart |
Click on the link above to get a pdf of the combustible dust chart.
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