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 705/24.06
All rock dust used shall meet the following specifications: 1
Laws 1953, p. 701.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.