Section 325.51501. Scope and application.

(1) The rules in this part apply to all occupational exposures to acrylonitrile (AN), chemical abstracts service registry no. 000107131, except as provided in subrules (2) and (3) of this rule.

(2)    The rules in this part do not apply to exposures that result solely from the processing, use, and handling of the following materials:

(a)   Acrylonitrile-butadiene-styrene (ABS) resins, Styreneacrylonitrile (SAN) resins, nitrile barrier resins, solid nitrile elastomers, and acrylic and modacrylic fibers in the form of finished polymers, including products fabricated from such finished polymers.

(b)    Materials made from or containing AN, or both, for which objective data is reasonably relied upon to demonstrate that the material is not capable of releasing AN in airborne concentrations of more than 1 part per million (ppm) as an 8-hour, time- weighted average under the expected conditions of processing, use, and handling which cause the greatest possible release.

(c)   Solid materials made from or containing AN, or both, which will not be heated above 170 degrees Fahrenheit during handling, use, or processing.

(3)    An employer who relies on the exemption in subrule (2)(b) of this rule shall maintain records of the objective data supporting that exemption and of the basis of the employer’s reliance on the data, as provided in R 325.51521.

History: 1980 AACS; 2015 AACS.