# Marking requirements.

**Citation:** 49 CFR 172.304  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) The marking required in this subpart—

(1) Must be durable, in English and printed on or affixed to the surface of a package or on a label, tag, or sign.

(2) Must be displayed on a background of sharply contrasting color;

(3) Must be unobscured by labels or attachments; and

(4) Must be locate

## Document text

(a) The marking required in this subpart—

(1) Must be durable, in English and printed on or affixed to the surface of a package or on a label, tag, or sign.

(2) Must be displayed on a background of sharply contrasting color;

(3) Must be unobscured by labels or attachments; and

(4) Must be located away from any other marking (such as advertising) that could substantially reduce its effectiveness.

(b) [Reserved]

[Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 172-29B, 41 FR 57067, Dec. 30, 1976]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-172.304>
- Source ID: `ecfr`
- SHA-256: `5ded0051e8a3080943e889ed7cc8554cdb506950b0ea1ffb7d7a993154f9fc9e`
- Retrieved: 2026-08-20T05:45:59.130Z
- Exported: 2026-08-23T16:05:00.508Z
- Document slug: `49-cfr-172-304`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "172",
  "section": "172.304",
  "subpart": "Subpart D—Marking",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```