Current through Public Act 103-1052
Section 225 ILCS 705/24.06All rock dust used shall meet the following specifications:
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.