§ 173.53 Provisions for using old classifications of explosives.
Current through Sep 25, 2026 · Read all of Part 173
Where the classification system in effect prior to January 1, 1991, is referenced in State or local laws, ordinances or regulations not pertaining to the transportation of hazardous materials, the following table may be used to compare old and new hazard class names:
| Current classification | Class name prior to Jan. 1, 1991 |
|---|---|
| Division 1.1 | Class A explosives. |
| Division 1.2 | Class A or Class B explosives. |
| Division 1 3 | Class B explosive. |
| Division 1.4 | Class C explosives. |
| Division 1.5 | Blasting agents. |
| Division 1.6 | No applicable hazard class. |
Interpretation letters (3)
- Clarification of the HMR applicable to the classsification of explosives — PHMSA, Apr 10, 2009
- "Chemical Ammunition Containing Incendiary Charges or White Phosphorus Either With or Without Bursting Charges" — PHMSA, Aug 30, 1994
- References to Poison A and Explosives A and B — PHMSA, Jun 2, 1993