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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #21-0090

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: High Precision Gas

Individual Name: Mr. Justin Wai

Location State: CA Country: US

View the Interpretation Document

Response text:

January 6, 2022

Mr. Justin Wai
High Precision Gas
10770 Painter Avenue
Santa Fe Springs, CA  90670

Reference No. 21-0090

Dear Mr. Wai:

This letter is in response to your September 8, 2021, email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to cylinder markings. Specifically, you ask whether a cylinder may have a marking with the proper shipping name of "UN1075, Petroleum gases, liquefied, 2.1," as well as a secondary marking of "Butane."

In accordance with 49 CFR 172.301(a)(1), each person who offers a hazardous material for transportation in a non-bulk packaging must mark the package with the proper shipping name and identification number for the material contained within, as shown in the § 172.101 Hazardous Materials Table. However, special provision 19 permits use of the identification number "UN1075" in place of "UN1011" for butane in domestic transportation only. Based on the information provided in your email, your hazardous material may be described and marked as either "UN1075, Petroleum gases, liquefied, 2.1," or "UN1075, Butane, 2.1." The identification number used must be consistent on package markings, shipping papers, and emergency response information.

While the HMR do not prohibit the inclusion of "Butane" as a secondary marking in addition to the proper shipping name of either "UN1075, Petroleum gases, liquefied, 2.1," or "UN1075, Butane, 2.1," this may cause confusion in transportation and result in the frustration of your shipment.

I hope this information is helpful. Please contact us if we can be of further assistance.


T. Glenn Foster
Chief, Regulatory Review and Reinvention Branch
Standards and Rulemaking Division

172.101, 172.301(a)(1)

Regulation Sections

Section Subject
172.101 Purpose and use of hazardous materials table
172.301 General marking requirements for non-bulk packagings