USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Oxygen Gas Generator

A chemical oxygen generator is a device containing compounds that upon activation release oxygen as a product of a chemical reaction. Chemical oxygen generators are found in devices such as passenger service units (PSU) for aircraft and portable breathing equipment.

A chemical oxygen generator that is shipped with an explosive or non-explosive means of initiation attached must be classed and approved by the Associate Administrator in accordance with § 173.56.

Follow the instructions on the Explosives page, How to apply for an Explosives Approval, to obtain an EX letter.
For more information on packaging and shipping chemical oxygen generators see § 173.168.

The explosive approval request should contain the following:

  • Request Letter as described in 49 CFR 107.705
  • Examination and class recommendation report from a DOT-Approved Explosive Test Lab or a recognized competent authority of a foreign government.
  • A complete summary table for all the explosive compositions contained in the explosive substance or article, the percentages by weight shown and the composition of all mixtures specifically enumerated.
  • Engineering drawings in 8.5 X 11 in. format of all the explosive articles with names, product number or drawing numbers that correspond to the class recommendation report.
  • Designation of Agent (This applies to foreign manufacturers only).

Requests for confidential treatment must be marked in accordance with 49 CFR 105.30.