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Explosives FAQ

Q1. I have an Explosives Classification Approval (EX) with a seven-digit number and I understand that the U.S. Department of Transportation's Office of Approvals has changed the numbering system to a 10-digit number. Will my company have to apply for a new number? May I use packagings, labels and/or stamps with the old number?

A1. At the beginning of the Year 2000, it became necessary to revamp the CA numbering system, and the 10-digit numbering system was developed. The old seven-digit number (and in a few cases, the nine-digit number) and the new 10-digit number are interchangeable. It is NOT necessary to apply for a new number. For all CA's including renewals (which include EX Approval letters) the new 10-digit number will be used. If your company is using packagings, labels, and/or stamps with the old number, you may continue to use them until your supply has been exhausted. All new packagings, labels and/or stamps must have the new number on them.

Q2. I am with the Department of Defense and I need a copy of an existing Competent Authority Classification of Explosives (EX approval letter). How can I obtain a copy of an existing EX letter (for military purposes)?

A2. To obtain a copy of an existing EX approval letter issued to the U.S. Department of Defense, refer to the Joint Hazard Classification System (JHCS) at or Further questions should be referred to your specific Military Service point of contact as identified in the Defense Transportation Regulation (DTR), Cargo Movement (Part II) chapter 204 at

Q3. I submitted an application to obtain an EX classification approval and I have been checking my email for a copy of the EX approval letter. So far nothing has been sent. What is the time frame for obtaining a EX approval letter?

A3. The approval processing time is up to 120 days for EX classification approvals. You can view the status of your submission by entering the tracking number your application was assigned at the time of submittal into the search field at:

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