# Hazardous Materials: Aluminum Cylinders Manufactured of Aluminum Alloy 6351-T6 Used in SCUBA, SCBA, and Oxygen Services-Revised Requalification and Use Criteria
> **Pipeline and Hazardous Materials Safety Administration** · Final rule. · Published 2006-08-29 · Effective 2007-01-01 · 71 FR 51122
## Document
- **Document number:** E6-14255
- **Category:** hazmat
- **Sub-agency:** Pipeline and Hazardous Materials Safety Administration
- **Federal Register citation:** 71 FR 51122
- **CFR reference:** 49 CFR 173
- **Publication date:** 2006-08-29
- **Effective date:** 2007-01-01
- **DOT docket:** Docket No. PHMSA-03-14405 (HM-220F)
## Abstract

This final rule revises the Hazardous Materials Regulations to address a known safety problem with cylinders manufactured of aluminum alloy 6351-T6. The revisions include an inspection and testing program for early detection of sustained load cracking on cylinders manufactured of aluminum alloy 6351-T6 and used in self-contained underwater breathing apparatus (SCUBA), self-contained breathing apparatus (SCBA), and oxygen services.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/08/29/E6-14255/hazardous-materials-aluminum-cylinders-manufactured-of-aluminum-alloy-6351-t6-used-in-scuba-scba-and)
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