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Section §172.400: General 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 172.400 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
21-0046 Jacam Catalyst, LLC Jason Ontjes View
21-0042 Texas Department of Public Safety Kelly F. McClatchy View
21-0008 Railsback HazMat Safety Professionals, LLC Rex C. Railsback View
20-0007 Oxyde Chemicals, Inc. Mr. Adrian Medina View
08-0243 Lovelace Gas Service, Inc. Mr. Bill Lovelace View
00-0144 Midwest Rubber Mfg., Inc. Ms. Darlene Rank View
02-0083 BOC Gases Jack B. Wer View
13-0191 Garland Welding Supply Mr. Andrew Simmons View
14-0204 Lockheed Martin Space Systems Compnay, SWFLANT Ms. Amanda B. Foskey View
98-0377 COSBO Mr. Jim Glessner View
06-0279 Wisconsin Propane Council Mr. Ronald Sutherland View
12-0110 Akrochem Corporation Scott Fleming View
98-0414 Hazmateam, Inc. Mr. Leo Traverse View
10-0127 AT&T Mr. Jim La Porte View
12-0059 Mr. William Briner View
06-0213 Allied Universal Corporation Ms. Robin J. Eddy Bolte View
06-0223 Minnesota Department of Transportation Mr. Michael Ritchie View
05-0044 FedEx Express Corporate Safety Department Mr. Marvin Sudduth  View
15-0243 Environmental Health & Safety Ms. Marilyn Winterburg View
04-0036 Margarita Internaciona Ms. Janet S. Abel View
16-0054 Infotrac, Inc. Mr. Jason Kob View
08-0303 OSI Ms. Carolynn Buenger                                      View