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Sand is a material used on Class D fires to smother blazes fueld by burning metals. Magnesium, to cite one example, is a commonly used metal in industry (and third behind iron and aluminum). If a magnesium fire breaks out, water won't put it out. (Water actually aids the fire.) The method of attack may well include dumping sand on the blaze. Burning titanium, potassium, sodium, lithium, uranium and even powdered aluminum require special fire supression techniques. There are a few other flammable metals to consider as well, but these are the most common.

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