Use Asbestos Limit 1926.58. As determined from breathing-zone air samples. Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and 760 torr. Milligrams of substance per cubic meter of air. The CAS number is for information only.
Enforcement is based on the substance name.
For an entry covering more than one metal compound, measured as the metal, the CAS number for the metal is given - not CAS numbers for the individual compounds. Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques. The percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable. Same as Particulates Not Otherwise Regulated. Polytetrafluoroethylene decomposition products.