1. All of the dust shall pass through a 20 mesh sieve, and at least 70% shall pass through a 200 mesh sieve. 2. The dust shall not contain more than 5% combustible matter, nor more than 5% free silica. The rock dust should be as light in color as possible. (225 ILCS 705/Art. 25 heading) ARTICLE 25. SAFETY LAMPS AND BAROMETERS.
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