---
kind: "section"
citation: "49 C.F.R. § 173.442"
title: "49"
number: "173.442"
heading: "Thermal limitations."
url: "https://uscodex.org/cfr/49/173.442"
---

# §173.442. Thermal limitations.


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.

## Notes

### Source

Source: Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97.