# Institute of Makers of Explosives — Hazardous Materials Safety Interpretation

- **operation:** document
- **citation:** 21-0062
- **title:** Institute of Makers of Explosives — Hazardous Materials Safety Interpretation
- **source type:** guidance
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** guidance
- **official:** true
- **published on:** 2022-03-09
- **effective on:** Not available
- **summary:** 21-0062 response to Institute of Makers of Explosives concerning 171.12, 171.22, 171.23, 173.56.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-21-0062.json
- **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-21-0062.md
- **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-21-0062
- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/76376/210062.pdf
**body:**

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1200 New Jersey Avenue, SE
Washington, DC 20590
U.S. Department
of Transportation
Pipeline and Hazardous
Materials Safety
Administration
March 9, 2022
Susan JP Flanagan
Institute of Makers of Explosives
1212 New York Avenue, NW, Suite 650
Washington, DC 20005
Reference No. 21-0062
Dear Ms. Flanagan:
This letter is in response to your June 7, 2021, email requesting clarification of the Hazardous
Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to explosives classification
(EX) approvals. Specifically, you ask for clarification on the impact of changes in corporate legal
structure on the status of existing EX approvals and ask for clarification on the reciprocity of
competent authority approvals authorized in the U.S. and Canada. You reference a Pipeline and
Hazardous Materials Safety Administration (PHMSA) guidance document titled, EXPLOSIVES
CLASSIFICATION (EX) APPROVALS (Company Name Changes, Mergers, Acquisitions, and
Changes in Legal Structure), and provide two scenarios regarding: (1) the transportation of
foreign-approved explosives through the U.S.; and (2) the transferability of a PHMSA-issued EX
approval issued to a domestic company to a Canadian facility owned and operated by the same
company.
For each scenario we have paraphrased and answered your questions as follows:
Scenario #1: Explosives products are manufactured in Canada and are authorized by the
Canadian competent authority.
Q1. You ask whether these products may be transported through the U.S. to a destination
outside of the U.S. without an EX approval.
A1. The answer is no. As specified in § 171.12(a), a hazardous material transported from
Canada to the United States, from the United States to Canada, or transiting the United
States to Canada or a foreign destination may be offered for transportation or transported
by motor carrier and rail in accordance with the Transport Canada TDG Regulations as
authorized in § 171.22, provided the requirements in §§ 171.22 and 171.23, as applicable,
are met. Section 171.23(b)(4) specifically requires that, prior to being transported within

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the United States, Class 1 (explosive) materials must be approved by the Associate
Administrator in accordance with § 173.56.
Q2. You ask whether these products may be transported into the U.S. to a distribution center
for further distribution outside of the U.S. without an EX approval.
A2. The answer is no. See answer A1.
Q3. You ask whether these products may be transported into the U.S. for use within the U.S.
without an EX approval.
A3. The answer is no. See answer A1.
Scenario #2: A U.S.-based manufacturer is contemplating manufacturing products at a company-
owned facility in Canada. The products have received EX approvals from PHMSA for domestic
manufacture and transportation. The products to be made in Canada would be:
• manufactured to the same specifications as the EX-approved products;
• manufactured using equipment comparable to that used to make the EX-approved
products;
• manufactured under the direction and supervision of the U.S. manufacturer; and
• shipped to the U.S. manufacturer for distribution within the U.S. as well as export to
other countries.
Q4. You ask whether the existing EX approvals apply, or would separate EX approvals be
required for the products intended to be made in Canada.
A4. The answer is no, the existing EX approvals would not apply, Specifically, separate EX
approvals are required. All manufacturing locations outside of the U.S. are required to
apply for their own EX approval.

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Furthermore, on October 8, 2019, PHMSA published a notice and request for
comment [84 FR 53822] titled “Hazardous Materials: Clarification of Process to
Reissue Explosives Classification Approvals.” While the policies in the table of the
guidance document, EXPLOSIVES CLASSIFICATION (EX) APPROVALS (Company
Name Changes, Mergers, Acquisitions, and Changes in Legal Structure), remain
unchanged, the notice is part of PHMSA’s efforts to update the guidance document
while addressing stakeholder comments.
I hope this information is helpful. Please contact us if we can be of further assistance.
Sincerely,
Dirk Der Kinderen
Chief, Standards Development Branch
Standards and Rulemaking Division

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Cardez
21-0062
_____________________________________________________________________________________________
The safety and security institute of the commercial explosives industry since 1913
June 7, 2021
Mr. William Schoonover
Associate Administrator, Hazardous Materials Safety
Pipeline and Hazardous Materials Safety Administration
U.S. Department of Transportation
East Building, 2nd Floor
1200 New Jersey Avenue, SE
Washington, DC 20590
Re: Explosives Classification (EX) Approvals (Company Name Changes, Mergers,
Acquisitions, and Changes in Legal Structure)
Dear Mr. Schoonover:
This letter concerns the current status and interpretation of the above-captioned document.
IME is occasionally contacted by both member and non-member companies regarding the impact
of changes in corporate legal structure on the status of existing EX Classification Approvals. We
also receive inquiries regarding reciprocity of approvals/authorizations between the US and
Canada. Typically, we refer the companies to the table PHMSA has published at,
https://www.phmsa.dot.gov/registration/faq-mergers-acquisitions-and-legal-status-changes-pdf.
As an initial matter, it appears that this information was originally published on April 2, 2015 and
we would like to confirm that the policies reflected in the table remain unchanged. If PHMSA has
updated the table or modified the underlying policies can you direct us to that information?
In addition, we understand that there is some reciprocity between the US and Canada regarding
explosives approvals/authorizations. Accordingly, we have the following questions regarding
interpretation/application of the information in the table as it applies to that reciprocity:
1. Explosives products are manufactured in Canada and are authorized by that country’s
Competent Authority. Can these products be:
a. Transported through the US to a destination outside of the US without an EX
approval?
b. Transported into the US to a distribution center for further distribution outside of
the US without an EX approval?
c. Transported into the US for use within the US without an EX approval?
2. A US-based manufacturer is contemplating manufacturing products at a company-owned
facility in Canada. The products have received EX approvals from PHMSA. The
products would be:
a. manufactured to the same specifications as the EX approved products;
1212 New York Avenue, NW, Suite 650, Washington, DC 20005, USA, (202) 429-9280, FAX (202) 293-2420

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b. manufactured using equipment comparable to that used to make the EX approved
products;
c. manufactured under the direction and supervision of the US manufacturer; and
d. shipped to the US manufacturer for distribution within the US as well as export to
other countries.
In this circumstance, would the existing EX approvals apply or would separate EX approvals
be required?
We appreciate your assistance in addressing these questions. Please contact me if you need
additional information.
Best Regards,
Susan JP Flanagan
Legislative & Regulatory Counsel
Institute of Makers of Explosives
202.674.7123
sjflanagan@ime.org
1212 New York Avenue, NW, Suite 650, Washington, DC 20005, USA, (202) 429-9280, FAX (202) 293-2420

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Cardez
21-0062
From: Foster, Glenn (PHMSA)
To: Cc: Date: Dodd, Alice (PHMSA); Hillman, Kenetha CTR (PHMSA)
Burger, Donald (PHMSA); DerKinderen, Dirk (PHMSA); Nickels, Matthew (PHMSA); Pfund, Duane (PHMSA)
Subject: FW: FINAL_EX Numbers_Canada 07JUN21.docx
Monday, June 7, 2021 11:47:01 AM
Attachments: FINAL_EX Numbers_Canada 07JUN21.docx
Alice and Kenetha,
Please log in the attached request for a Letter of Interpretation and assign it to the next Specialist in
the rotation.
Thanks,
Glenn
From: Pfund, Duane (PHMSA)
Sent: Monday, June 7, 2021 11:30 AM
To: Foster, Glenn (PHMSA) <Glenn.Foster@dot.gov>
Cc: DerKinderen, Dirk (PHMSA) <Dirk.DerKinderen@dot.gov>; Nickels, Matthew (PHMSA)
<Matthew.Nickels@dot.gov>; Constantino, Lindsey (PHMSA) <l.constantino@dot.gov>; Wiener,
Aaron (PHMSA) <Aaron.Wiener@dot.gov>; Webb, Steven (PHMSA) <steven.webb@dot.gov>; Leary,
Kevin (PHMSA) <Kevin.Leary@dot.gov>
Subject: FW: FINAL_EX Numbers_Canada 07JUN21.docx
Glenn – can you please log this into the interpretation system? Correct me if that’s not the
appropriate process.
From: Schoonover, William (PHMSA)
Sent: Monday, June 7, 2021 11:18 AM
To: Pfund, Duane (PHMSA) <Duane.Pfund@dot.gov>; Quade, William (PHMSA)
<william.quade@dot.gov>
Cc: Milline, Olivia (PHMSA) <olivia.milline@dot.gov>
Subject: FW: FINAL_EX Numbers_Canada 07JUN21.docx
Please prepare a response. Thanks
William S. Schoonover
Associate Administrator, Office of Hazardous Materials Safety
USDOT, PHMSA
1200 New Jersey Ave, SE, Washington, DC 20590
Office: 202.366.0656 ◊ Mobile: 202.495.9510
From: Susan Flanagan [mailto:sjflanagan@ime.org]
Sent: Monday, June 07, 2021 10:37 AM

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To: Schoonover, William (PHMSA) <william.schoonover@dot.gov>
Subject: FINAL_EX Numbers_Canada 07JUN21.docx
Mr. Schoonover,
Attached is a request for interpretation regarding reciprocity of approvals/authorizations
between the US and Canada.
Please let me know if you’d like additional information or if you have any questions.
I hope all is well!
Regards,
Susan
IME’s “Explosives: The Power Tool” video is must-see viewing!
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Susan JP Flanagan | Legislative & Regulatory Counsel | Institute of Makers of Explosives
1212 New York AVE NW, Ste 650 Washington, DC 20005| ( Direct: (202)266-4315 Mobile: (202) 674-7123 |
* sjflanagan@ime.org
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