# Dangerous Good of America — Hazardous Materials Safety Interpretation

**Citation:** 16-0066  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2016-07-12

16-0066 response to Dangerous Good of America concerning 171.8, 172.101, 173.140.

## Document text

<<<PAGE 1>>>

U.S. Department
of Transportation
Pipeline and Hazardous
Materials Safety
Administration
1200 New Jersey Avenue, SE
Washington, D.C. 20590
JUL 1 2 2016
Mr. Fred A. Romero
Instructor
Dangerous Goods of America
10400 NW 33 Street, Suite 230
Doral, FL 3 3 1 72
Ref. No.: 16-0066
Dear Mr. Romero:
This responds to your April 7, 2016 letter requesting clarification of the Hazardous Materials
Regulations (HMR; 49 CFR Parts 171-180). Specifically, you seek clarification of the
definition of a hazardous substance in§ 171.8. You ask if all hazardous substances listed in
Appendix A to§ 172.101 of the HMR must be declared as hazardous materials, or ifthe
hazardous substances are only hazardous materials when packaged in quantities equal to or
exceeding the reportable quantity in Appendix A. In addition, you ask if a hazardous
substance that does not meet the definition of any other class or division should be assigned to
Class 9 under the entries for UN3082 or UN3077.
Under § 171.8, a hazardous substance (other than radionuclides) is defined as a material,
including its mixtures and solutions, that: (1) is listed in the Appendix A to § 172.101 of the
HMR; (2) is in a quantity, in one package, which equals or exceeds its RQ listed in the
Appendix A to§ 172.101 of the HMR; and (3) when in a mixture or solution, is in a
concentration by weight which equals or exceeds the concentration corresponding to the RQ
of the material, as shown in the tablein § 171.8. A material must meet all of these
requirements in order to be a hazardous substance. A hazardous substance that is not listed by
name in the § 172.101 Hazardous Materials Table and is not more appropriately described by
another proper shipping name may be assigned to Class 9 under the entries "UN3077, ·
Environmentally hazardous substances, liquid, n.o.s." and "UN3082, Environmentally
hazardous substances, solid, n.o.s." in accordance with § 173. l 40(b ).
I hope this information is helpful. If you have further questions, please do not hesitate to
contact this office.
Sincerely,
Duane A. Pfund
International Standards Coordinator
Standards and Rulemaking Division

<<<PAGE 2>>>

DANGEROUS GOODS OF AMERICA®
PO BOX 520487 + MIAMI, FL 33152-0487 USA
Phone (305-801-7788
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E-mail: 1nt0Cd.ldga4u.com
Web: www.dga4u.com
April 7, 2016
Standards and Rulemaking Division
Att: phh-10
East Bldg, 1200 New Jersey Avenue
S.E., Washington, DC 2059001
Pipeline and Hazardous Material Safety Administration
US Department of Transportation
Re: Appendix A to §172.101
Second Request
Dear Chief;
On August 25, 2015 I asked to:
Please clarify the following:
According to § 171.8 the definition of Hazardous Materials, the term includes Hazardous Substances.
And defined:
Hazardous substance- for the purposes of this subchapter, means a material, including its mixtures and
solutions that-
1) is listed in the appendix A to § 172. 101 of this subchapter;
2) Is in a quantity, in one package, which equals or exceeds the reportable quantity (RQ) listed in the
appendix A to §172.101.
Question:
Is all that are listed in appendix A to §172. 101 considered hazardous substance and must be declared as a
hazardous material or
Only when it is packaged in quantities equal to or exceeds the reportable quantity indicated in the
reportable quantity column of appendix A to § 172. 101?
Office & Training Facility • 10400 NW 33 Street
Suite 230 + Doral, FL 33172 + USA

<<<PAGE 3>>>

DANGEROUS GOODS OF AMERICA ®
PO BOX 520487 • MIAMI, FL 33152-0487 USA
Phone (305-801-7788
E-mail: into@dga4u.com
Web: www.dga4u.com
If so and if the substance or material does not meet the definition of any other class or division, should this
hazardous substance be assigned to class 9 and identified as UN3082 or UN3077?
Your kind and prompt attention to this matter is greatly appreciated.
Thank you
If possible please send your response via email to fred@dga4u.com
Dangerous Goods of America
Office & Training Facility • 10400 NW 33 Street
Suite 230 • Doral, FL 33172 • USA

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2016/160066.pdf>
- Source ID: `phmsa`
- SHA-256: `d20a0c063b0a8357f5817f86e316c202e85fd859825ef88e98669ad5a2fbcf2a`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T22:07:49.128Z
- Document slug: `phmsa-interpretation-16-0066`

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