# Specification cylinders for liquid hazardous materials.

- **operation:** document
- **citation:** 49 CFR 173.205
- **title:** Specification cylinders for liquid hazardous materials.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** When § 172.101 of this subchapter specifies that a hazardous material must be packaged under this section, the use of any specification or UN cylinder, except those specified for acetylene, is authorized. Cylinders used for toxic materials in Division 6.1 or 2.3 must conform to the requirements of §
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-173-205.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-173-205.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-173-205
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-173.205
**body:**

When § 172.101 of this subchapter specifies that a hazardous material must be packaged under this section, the use of any specification or UN cylinder, except those specified for acetylene, is authorized. Cylinders used for toxic materials in Division 6.1 or 2.3 must conform to the requirements of § 173.40.

[71 FR 33881, June 12, 2006]
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- **body characters:** 338