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Combustible dust explosion hazards exist in a variety of industries, including food (e.g., candy, starch, flour, feed), plastics, wood, rubber, furniture, textiles, pesticides, pharmaceuticals, dyes, coal, metals (e.g., aluminum, chromium, iron, magnesium, and zinc), and fossil-fuel power generation.
Experi-. mentally produced dust explosions using 200 mesh polyurethane dust indicate that minimum airborne concentrations of 25-30. grams dust per cubic meter of air are required before an explosion can occur. Other experiments suggest 100 - 200 grams per. cubic meter as the lowest critical concentration.