# UL LLC — Hazardous Materials Safety Interpretation

**Citation:** 21-0069  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2022-07-26

21-0069 response to UL LLC concerning 173.309.

## Document text

<<<PAGE 1>>>

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## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/76616/210069.pdf>
- Source ID: `phmsa`
- SHA-256: `3b0ace5f44f1d301df192d98f8f448443d718588d364c168bfac837f6bd9802c`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T19:26:00.232Z
- Document slug: `phmsa-interpretation-21-0069`

### Source metadata

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  "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.",
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```