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Section §172.402: Additional labeling requirements

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 172.402 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0005 Steve Laughlin View
22-0041 Pilot Chemical Company Megan O’Connor View
21-0037 Law Offices of Steven W. Hansen Steven W. Hansen View
13-0003 Air Liquide USA LLC Mr. Jerry W. Freeman View
98-0159 Atotech USA Inc Mr. Scott Waddell View
05-0234 Letexco U.S. Mr. Kevin M. Callinan View
05-0079 Arkema, Inc. Ms. Christina M. Kurtz View
11-0175 NitroxFox LLC. Mr. John Fox View
05-0269 ASTAR Air Cargo Inc. Mr. Gerry G. Kefalinos View
03-0096 Fisher Chemicals Ms. Jeanette DeGennaro View
13-0239 Pilot Chemical Company Mr. David A. Polland View
07-0079 National Institute of Standards and Technology Mr. Larry Lucas  View
15-0084 United States Air Force Mr. Jeremy McCauley View