# Supresta Built-In Defense — Hazardous Materials Safety Interpretation

**Citation:** 05-0214  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2005-11-21

05-0214 response to Supresta Built-In Defense concerning 172.101.

## Document text

<<<PAGE 1>>>

U.S. Department
of Transportation
Washington, D.C. 20590
400 Seventh Street, S.W.
Pipeline and
Administration
Hazardous Materials Safety
NOV 21 2005
Dr. Andy Wang
Ref. No. 05-0214
Supresta Built-In Detense
Ardsley Park
420 Saw Mill River Road
Ardsley, NY 10502
Dear Dr. Wang:
This is in response to your September 12, 2005, letter requesting clarification of the
Hazardous Materials Regulations (HMR; 49 CFR Parts 100-185). Specifically, you request
confirmation from this Office that a product that contains 1 - 4% triphenylphophate in
combination with tert-butylated triphenylphosphates is neither a marine pollutant nor a severe
marine pollutant and therefore, is not subject to the HMR.
Under § 173.22, it is the shipper's responsibility to properly classify and describe a hazardous
material. This Office does not normally perform that function. However, based on the
information submitted, it is the opinion of this Office that a triphenyl phosphate/tert-butylated
triphenyl phosphates mixture containing 1% to 4% triphenyl phosphates is not a marine
pollutant nor a severe marine pollutant according to Appendix B in § 172.101. Therefore,
provided your product does not otherwise meet the definition of a hazardous material
(§171.8), it is not subject to the HMR.
Sincerely,
Chief, Standards Development
Office of Hazardous Materials Standards
172.101
050214

<<<PAGE 2>>>

BAH
August 25, 2005
5172101
Mr. Edward T. Mazzullo
Classification
Director, Office of Hazardous Materials Standards
U.S. DOT/PHMSA(PHH-10)
400 7* Street S.W.
05-0214
Washington, D.C. 20590-0001
Dear Mr. Mazzullo:
We recently spoke with Kevin of your office in regard to a question about the
classification of a product. He suggested that we contact you in order to get written
confirmation.
We have a product that contains 1 - 4% triphenylphosphate in combination with tert-
butylated triphenylphosphates. In our conversation, Kevin indicated that this product
would not be regulated as either a marine pollutant or a severe marine pollutant.
Please confirm that this product would be accurately classified as non-regulated for
transportation purposes
Thank you for your review of this product. If you have any questions, please feel free to
contact me at (914) 269-5928.
Sincerely,
implan
. Andy Wang
Regulafory Affairs Manager
Cc: Mark Buczek

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2005/050214.pdf>
- Source ID: `phmsa`
- SHA-256: `714d7b107cf2dfde64d64ac46e765890fb7f752030673a4067dfdc58032ec8e9`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T10:00:53.457Z
- Document slug: `phmsa-interpretation-05-0214`

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