Combustible Dust is....
The U.S. Chemical Safety and Hazard Investigation Board (CSB) identified 281 combustible dust incidents between 1980 and 2005 that led to the deaths of 119 workers, injured 718, and extensively damaged numerous industrial facilities. (For More Information: https://www.osha.gov/dsg/combustibledust/)
Examples of combustible materials in manufacturing: food (candy, sugar, spice, starch, flour, feed), grain, tobacco, plastics, wood, paper, pulp, rubber, pesticides, pharmaceuticals, dyes, coal, metals (e.g., aluminum, chromium, iron, magnesium, and zinc)
Dust Explosion Pentagon- oxygen, heat, fuel, dispersion, and confinement
Secondary Explosions occur when “fugitive dust” has been dislodged, typically from a primary explosion incident. Often the additional dust dispersed into the air may cause one or more secondary explosions and can be far more destructive than a primary explosion due to the increased quantity and concentration of dispersed combustible dust. Many deaths and extensive damages to facilities have been linked to secondary explosions.