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Section §172.401: Prohibited labeling

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 172.401 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
20-0074 Clark Hill PLC Justin J. Marks View
19-0128 Tyson Foods Carolyn Griffith View
18-0129 AmeriGas Propane Christopher Wagner View
03-0065 Eliokem, Inc. Mr. Dennis McMahan View
16-0122 PRI International, Inc. Mr. Vincent Vitollo View
12-0167 FedEx Express Mr. David Littlejohn View
12-0150 Horizon Lines Mr. Clifford Bartley View
15-0010 Hexagon Ragasco North America Inc. Mr. Jonas Berglund View
98-0150 Browning Chemical Corp. Mr. Bruce M. Pershan View
99-0127 Federal-Mogul Power train Systems Mr. Scott Holder View
99-0076 Commercial Vehicle Consultant Mr. Ralph B. Wood View
14-0026 Working Solutions, Inc. Mr. Jay Davis View
13-0208 Avantor Performance Material, Inc. Dr. Donald R. Paulus View
15-0026 Arkema Inc. Ms. Christina Kurtz View
15-0075 Dexsil Corporation Mr. Andrew Lynn View
05-0234 Letexco U.S. Mr. Kevin M. Callinan View
14-0103 Von Briesen & Roper, S.C. Attorneys at Law Mr. Mark F. Foley View
06-0127 Lockheed Martin Aeronautics Company Mr. Michael S. Fiddes View
13-0191 Garland Welding Supply Mr. Andrew Simmons View
09-0174 Mr. Steven H. Wodka View
13-0192 Nynas USA, Inc. Mr. Edward Skelton View
04-0224 Rhodia, Inc. Ms. Donna Edminster View
02-0286 Morton International Walter Sherwood View
02-0285 ArthurP. Hancock View
06-0230 Wiley Rein & Fielding LLP Mr. George A. Kerchner View
17-0007 Schuster Metals, LLC Mr. John Lehman and Mr. Samuel Essak View
07-0156 Dangerous Goods Advisory Council Mr. Michael Morrisette View
06-0182 Solvay Chemicals Mr. Marc Feldman View
13-0038 Monsanto Company Mr. David Peters View
10-0042 Toyota Motor Sales, USA, Inc. Mr. Wieten View