49 C.F.R. § 178.358 Specification 21PF fire and shock resistant, phenolic-foam insulated, metal overpack.
Title 49 - Transportation
Title 49: Transportation
PART 178—SPECIFICATIONS FOR PACKAGINGS
Subpart K—Specifications for Packagings for Class 7 (Radioactive) Materials
§ 178.358 Specification 21PF fire and shock resistant, phenolic-foam insulated, metal overpack.

