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Section §177.835: Class 1 materials

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 177.835 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
18-0123 Jet Research Center Mark Cipolla View
16-0202 Valley View Industries, Inc Timothy Kenney View
98-0376 Pratt & Whitney Ms. Jenny Hobby View
98-0553 Mr. Kent Blair View
10-0107 California National Guard U.S. Army Mr. Robert Morrow View
11-0166 Con-way Freight Ms. Marie Easley-Cook View
05-0089 Georgia Department of Motor Vehicle Safety Capt. Bruce Bugg View
08-0119 Bluegrass Army Depot Ms. Gretchen Schmidt View
07-0164 Central States Fireworks Mr. Alex Weise     View
08-0192 Titan Specialties, Ltd. Ms. Shelly Espinoza View
98-0163 Mr. Kent F. Blair View
98-0562 Mr. Kent Blair View
09-0152 Fort Wainwright Ammunition Supply Point Mr. William H. Orth III View
07-0150 Owner-Operator Independent Drivers Association, Inc. Mr. Kip Hough View
04-0258 Military Surface Deployment and Distribution Command View
16-0039 GEO Dynamics Inc. Mr. Brett Lehman View
09-0268 Dole Explosives, Inc. Mr. Samuel Dole View
13-0007 Wakefield Drilling & Blasting Mr. Darren Wakefield View