# Provisions for using old classifications of explosives.

**Citation:** 49 CFR 173.53  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

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 na

## Document text

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.

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-173.53>
- Source ID: `ecfr`
- SHA-256: `083258b64306ac779b415ea8b1f8a5410979d9baea6675d6b01401f99a0ff56c`
- Retrieved: 2026-08-20T05:46:04.092Z
- Exported: 2026-08-22T15:03:44.247Z
- Document slug: `49-cfr-173-53`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "173",
  "section": "173.53",
  "subpart": "Subpart C—Definitions, Classification and Packaging for Class 1",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```