May 4, 2021: Hazardous Materials: Show Cause and Procedures for Complying with UN Model Regulation Test Criteria for Specific Explosive Classification Approvals

The Pipeline and Hazardous Materials Safety Administration issued a notice to those who currently hold Explosive (EX) approvals on four specific Division 1.4S explosives of the process necessary for maintaining or upgrading these
approvals. Those holding approvals on UN0349, UN0367, UN0384, and UN0481 must now pass an additional test in order to continue to maintain the 1.4S classification.

Docket No. PHMSA–2017–0108, Notice No. 2021–03