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Subpart A—General19

Subpart B—Preparation of Hazardous Materials for Transportation22

Subpart C—Definitions, Classification and Packaging for Class 118

Subpart D—Definitions Classification, Packing Group Assignments and Exceptions for Hazardous Materials Other Than Class 1 and Class 726

Subpart E—Non-bulk Packaging for Hazardous Materials Other Than Class 1 and Class 763

Subpart F—Bulk Packaging for Hazardous Materials Other Than Class 1 and Class 79

Subpart G—Gases; Preparation and Packaging36

Subpart I—Class 7 (Radioactive) Materials47

Regulationcurrent

49 CFR 173.442

Thermal limitations.

Current as of 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

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A package of Class 7 (radioactive) material must be designed, constructed, and loaded so that—#

(a)The heat generated within the package by the radioactive contents will not, during conditions normally incident to transport, affect the integrity of the package; and#

(b)The temperature of the accessible external surfaces of the loaded package will not, assuming still air in the shade at an ambient temperature of 38 °C (100 °F), exceed either—#

(1)50 °C (122 °F) in other than an exclusive use shipment; or#

(2)85 °C (185 °F) in an exclusive use shipment.#