U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Standards.gov

Hazardous Materials: Adoption of Department of Transportation Special Permit 21379

FR Abstract
This final rule removes undue regulatory burdens by adopting the provisions of U.S. Department of Transportation (DOT) special permit (SP) 21379 to streamline the transportation of refrigerating machines and components containing certain low flammability refrigerant gases.
Incorporation
FR Document Number
2026-15818
Federal Register Volume
91
Federal Register Year
2026-08-04
Federal Register Start Page
49315
Federal Register End Page
49320
Federal Agency
Transportation Department
Federal Register Link
https://www.govinfo.gov/content/pkg/FR-2026-08-04/pdf/2026-15818.pdf
CFR Citation
49 CFR 173
FR Citation
91 FR 49315
CFR title
49
CFR Part
173
Document Number
GHS Rev. 9
Document Edition
2021
Standard Title
Globally Harmonized System of Classification and Labelling of Chemicals, 9th Revised Edition, ST/SG/ AC.10/30/Rev.9
SDO
United Nations Economic Commission for Europe
Standard Number Link
https://unece.org/transport/standards/transport/dangerous-goods/ghs-rev9-2021
Excerpts
materials incorporated by reference in the HMR are handled via the rulemaking process, which allows for the public and regulated entities to provide input. During the rulemaking process, PHMSA must also obtain approval from the Office of the Federal Register to incorporate by reference any new materials. The Office of the Federal Register issued a rulemaking that revised 1 CFR 51.5 to require that an agency detail in the preamble of a notice of proposed rulemaking (NPRM) the ways the materials it proposes to incorporate by reference are reasonably
Record Source
www.federalregister.gov