Code of Massachusetts Regulations
454 CMR - DEPARTMENT OF LABOR STANDARDS
Title 454 CMR 21.00 - "Right to Know" Law M.G.L. c. 111F
Section 21.05 - Labels

(1) Location. Labels shall be prominently located on the container in its upright position when the container is in its usual position for use, so as to be legible.

(2) Type. Names on labels shall be in bold face letters.

(3) Legibility. The chemical name and the NFPA Code, if applicable, of the toxic or hazardous substances, in English and on a distinctly contrasting background, shall be affixed to the container.

(4) Weather Exposure. Labels on containers exposed to the elements of the weather shall be such that the reading matter is clear and conspicuous at all times and will not be defaced or obliterated by rain, snow or other adverse elements of the weather.

(5) Secondary Containers. If a labeled container is covered by a secondary container or a covering that remains in place while the contents of the container are withdrawn or used therefrom, the required labels shall also appear on the secondary container or covering.

(6) Mixtures. Containers of mixtures shall be labeled with the chemical name listed on the MSDS for each toxic or hazardous substance in the mixture, subject to the limitations and exceptions appearing in M.G.L. c. 111F, § 7. It is recommended that containers of mixtures be also labeled with the common name of the mixture.

(7) Typography Size. The size of type on labels shall substantially comply with the following minimum requirements: