24 CFR §51.207
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The Secretary or the Secretary's designee may, on a case-by-case basis, when circumstances warrant, require the application of this subpart C with respect to a substance not listed in appendix I to this subpart C that would create thermal or overpressure effect in excess of that listed in § 51.203.