49 C.F.R. § 173.141 Class 9—Assignment of packing group.
Title 49 - Transportation
The packing group of a Class 9 material is as indicated in column 5 of the §172.101 table.
Title 49: Transportation
PART 173—SHIPPERS—GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS
Subpart D—Definitions Classification, Packing Group Assignments and Exceptions for Hazardous Materials Other Than Class 1 and Class 7
§ 173.141 Class 9—Assignment of packing group.