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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.
If a combustible material undergoes a phase transition (solid-->liquid or liquid-->vapour) then its temperature cannot increase until the transition is completed; so the plastic cannot burn when it's still liquid, if the amount of combustible vapour present is not enough to produce a flame.