10/13/1998 - Definition of a mixture under the Hazard Communication standard

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Title: 10/13/1998 - Definition of a mixture under the Hazard Communication standard.
Record Type: InterpretationStandard Number: 1910.1200(c); 1926.59(c)

    October 13, 1998

    Ms. Katerina Eftimoff
    Porter, Wright, Morris & Arthur
    41 South High Street
    Columbus, Ohio 43215-6194

    Dear Ms Eftimoff:

    Thank you for your letter of May 1, to the Occupational Safety and Health Administration (OSHA) regarding the definition of a mixture under the Hazard Communication Standard (HCS), 29 CFR 1910.1200. You asked OSHA to make the determination of whether your client's product, Iroblast, is a "mixture" as defined by the standard. Please excuse this delay in our response.

    OSHA does not make hazard determinations on a case-by-case basis, since it is the manufacturer who is most familiar with a product's composition, its intended uses, and the potential downstream exposures. We are not generally involved in the hazard determination process until it is brought to our attention that the manufacturer's MSDS may be incomplete or inadequate.

    Regardless of the outcome of the manufacturer's determination of Iroblast as a "mixture" or a "single substance," all information listed under paragraphs (g)(2)(i) - (xii) must be included on the MSDS. Since the use of Iroblast, as stated in your letter, presents hazardous exposures to employees during its intended use, these exposures, their health effects, and all other required information must be reported on the MSDS. We offer the following guidance for your client in making the determination of whether this product is a mixture or a chemical:

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    1. A hazardous chemical is considered a mixture if the components retain their chemical identity after being combined. In this case, the components can be separated by mechanical means (evaporation, distillation, abrasion, etc.).

    2. A chemical reaction results in a change in the arrangement of atoms or molecules to yield substances of different composition and properties. When chemical reactions occur, the original components can not be separated by mechanical means.

    We trust that this information is useful to you. Further questions can be directed to the Office of Health Compliance Assistance at 202-219-8036.

    Sincerely,

    Richard E. Fairfax
    Acting Director
    Directorate of Compliance Programs

The original official public domain version of this document is available from OSHA at XXXOSHAURL.