On Monday, April 25, 2016 the Pipeline and Hazardous Materials Safety Administration (PHMSA) published a correction to the 49CFR Hazardous Materials regulations in the Federal Register.
The correction states:
“In Title 49 of the Code of Federal Regulations, parts 100 to 177, revised as of October 1, 2015, on page 269, in § 172.101, in the Hazardous Materials Table, for the entry ‘‘Phenylmercuric compounds, n.o.s.’’ add ‘‘G’’ in the first column.”
The federal register notice can be viewed here: https://www.gpo.gov/fdsys/pkg/FR-2016-04-25/pdf/2016-09615.pdf
The “G” in the first column of the Hazardous Materials Table (HMT) identifies proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses, in association with the basic description. The technical name(s) must be shown on package marking and shipping papers. Failure to comply with the corrected information can result in non-compliant shipments.