Global Industrial Packaging — Hazardous Materials Safety Interpretation

Page 11200 New Jersey Avenue, SE Washington, DC 20590 U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration July 15, 2025 John Foryt Director, Global Product Safety & Compliance Global Industrial Packaging 366 Greif Parkway Delaware, Ohio 43015 Reference No. 25-0060 Dear Mr. Foryt: This letter is in response to your May 1, 2025 email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to markings on UN specification non-bulk performance-oriented packagings. Specifically, can a single UN symbol be used to meet the requirements in § 178.503(a)(1) when multiple (e.g., two or more) markings are included on a packaging. No. In accordance with § 178.3(c), the HMR specifically states if more than one marking appears on a packaging, each marking must appear in its entirety. Thus, each marking string must include its own UN symbol or the letters “UN” as part of the marking string. I hope this information is helpful. Please contact us if we can be of further assistance. Sincerely, Dirk Der Kinderen Chief, Standards and Development Branch Standards and Rulemaking Division#

Page 2May 1, 2025 Mr. Shane Kelley Director, Standards and Rulemaking Division U.S. DOT/PHMSA (PHH-10) 1200 New Jersey Avenue, SE East Building, 2nd Floor Washington, DC 20590 Submitted via email to infocntr@dot.gov Letter of Interpretation Request Dear Mr. Kelley: On behalf of Greif Inc. (GBC), this communication is to request a formal letter of interpretation around the requirements for marking UN packaging in 49 CFR 178.503. Specifically, Greif wishes to understand whether a single UN symbol can be used to meet the requirements of 178.503(a)(1) when multiple (2 or more) markings are included on a packaging. To better illustrate the question, the below graphic highlights the above-mentioned scenario where a 1H1 plastic drum carries two markings in the embossment. While the requirements for the inclusion of the lowercase UN symbol in a mark are clear, the CFR text does not make clear whether each mark must begin with a separate UN symbol, or if one large symbol at the beginning of each mark fulfills the requirement. Thank you for your attention and response to Greif’s request for a formal letter of interpretation. Global Industrial Packaging 366 Greif Parkway – Delaware, Ohio 43015 Corporate Office 425 Winter Road – Delaware, Ohio 43015 www.greif.com#

Page 3Sincerely, John Foryt Director, Global Product Safety & Compliance John.Foryt@Greif.com 614-499-4919 Global Industrial Packaging 366 Greif Parkway – Delaware, Ohio 43015 Corporate Office 425 Winter Road – Delaware, Ohio 43015 www.greif.com#