The October 27 notice is a proposal, not a new operating rule
PHMSA published a notice of proposed rulemaking under docket PHMSA-2025-0048 (HM-215S) on October 27. The agency proposes to update parts 171, 172, 173, 175, 176, 178 and 180 of the Hazardous Materials Regulations. The notice does not make the proposed revisions effective today, so drivers, shippers and carriers must continue following the current HMR unless and until PHMSA issues a final rule with compliance dates.
PHMSA is aligning U.S. rules with the next international cycle
The proposal draws from the 24th revised edition of the UN Model Regulations, the 2027–28 ICAO Technical Instructions, Amendment 43-26 to the IMDG Code, updated Canadian dangerous-goods rules and revised ISO standards. PHMSA says harmonization should reduce inconsistent classifications and documentation, shipment delays and unnecessary costs while maintaining safety. Some provisions are specific to air or vessel transport, but changes to the Hazardous Materials Table, proper shipping names, hazard classes, packing groups, special provisions and packaging authorizations can also affect materials offered for highway transportation.
The proposal contains practical changes for common supply chains
Examples include a proposed Packing Group II entry for UN2348 butyl acrylates, revised chlorophenol entries, updated descriptions for lithium and sodium-ion batteries installed in cargo transport units, and recognition of heating machines alongside refrigerating machines under listed proper shipping names and exceptions. PHMSA also proposes to extend the in-transport device exception in 49 CFR 173.14 to qualifying sensors as well as data loggers and cargo-tracking devices. Whether a change applies will depend on the exact material, package, mode and special provision.
Packaging and cylinder programs should review the technical details
The NPRM would update incorporated ISO standards for pressure receptacles, cylinder valves and periodic inspection, revise stacking-mark instructions for intermediate bulk containers and large packagings, and address authorized large packagings for articles containing hazardous materials. These proposals matter most to shippers, packaging manufacturers, cylinder requalifiers and carriers that accept specialized hazmat loads. A fleet should not change markings, inspection intervals or packaging procedures from a headline; the exact regulatory text and any future transition dates will control.
Comments are due December 28
PHMSA will accept comments through December 28, 2026. Submissions should identify docket PHMSA-2025-0048 (HM-215S) or RIN 2137-AF75 and can be filed through Regulations.gov. Hazmat carriers can provide useful operational evidence about cross-border paperwork, training, package availability, inspection practices, implementation lead time and any safety or cost effect. Public comments are generally posted online, so confidential business information requires the special handling described in the notice.
Driver and fleet takeaway
For now, keep using the current Hazardous Materials Table, shipping-paper descriptions, labels, placards, packaging requirements and emergency-response information. Safety and compliance teams should compare the proposal with the commodities and packages they actually handle, flag affected UN numbers and special provisions, and coordinate with shippers before accepting a load. Do not retrain drivers or rewrite procedures as though the proposal were final. Instead, preserve a gap list, consider a docket comment before December 28, and wait for a final rule and its effective or compliance dates before implementing changes.
Federal Register — Hazardous Materials: Harmonization With International Standards
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