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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.
Subsets of class 4 are: 1  4.1 Flammable Solids are readily combustible, or may contribute to a fire through friction. These include: 2  Flammable solids. 3  Self reactive substances.  Solid desensitized explosives.