# Aero Tech Consumer Aerospace — Hazardous Materials Safety Interpretation

**Citation:** 98-0366  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 1999-05-13

98-0366 response to Aero Tech Consumer Aerospace concerning 173.22.

## Document text

<<<PAGE 1>>>

400 Seventh Street, S.W.
U.S.Department
Washington; D.C.
20590
of Transportation
Research and
Special Programs
Administration
MAY I 3 1999
Ref. No. 98-0366
Mr. Gary C. Rosenfield
President
Aero Tech Consumer Aerospace
1955 South Palm Street, Suite 15
Las Vegas, Nevada 89104
Dear Mr. Rosenfield:
This is in response to your letter dated November 25; 1998, requesting clarification on the applicability
of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) to your liquid slurry mixture
and requirements for placarding vehicles carrying Division 1,3 materials.
• Under 49 CFR 173.22, it is the shipper's responsibility to properly classify a hazardous material.
Based on the information you provided, we are not able to determine the proper classification. We
recommend that you evaluate and test your mixture to determine if it meets the hazard class defining
criteria in Part 173. We want to emphasize that if this composition is intended to produce an explosive
or pyrotechnic effect, it must be evaluated under the provisions in $ 173.56
In reference to your question on placarding, a manufacturer carrying Division 1.3 materials in its own or
rented vehicles in local or intrastate transportation, must placard the transport-vehicle in accordance
with 49 CFR 172.504. Effective October 1, 1998, the HMR now apply to both intrastate and
interstate transportation of hazardous materials in commerce.
I hope this answers your inquiry.
Sincerely;
in thills
Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standärds
173.22
980366

<<<PAGE 2>>>

407020
a By Cae
Boothe
CONSUMER AEROSPACE
$173.22
Industrial Solid Propulsion, Inc.
A Subsidiary of
Ed Mazzullo, DHM-10
Director of Office of Hazardous Materials Standards
Research and Special Programs Administration
400 Seventh Street, S.W.
U.S. Department of Transportation
Washington, D.C. 20590
11/25/98
Dear Mr. Mazzullo:
I would appreciate it if you could answer the following questions related to Hazmat
transportation:
1. Note: The following paragraph contains proprietary information*. Would
synthetic rubber (HTPB), 10% Isodecyl Pelargonate plasticizer (IDP), 38% Zinc, 29%
a liquid slurry mixture of approximately 21% Hydroxyl-Terminated Polybutadiene
Magnesium and 2% Chrome Oxide (Ci,O,) be considered a hazardous material as
defined in the HMR? If so, what would be its proper shipping name, hazard class, UN
number, packing group and label code?
2. Is a manufacturer required to placard its own or rented vehicles in local or intrastate
transportation while carrying division 1.3 materials?
Thank you in advance for your anticipated response.
Sincerely,
Gary C. Rosenfield
President, AeroTech,
*PROPRIETARY NOTICE: THIS INFORMATION IS THE SOLE AND EXCLUSIVE PROPERTY OF AEROTECH, INC.
CLASSIFICATION OF AEROTECH, INC. PRODUCTS FOR SHIPPING PURPOSES, ANY OTHER USE OR DISSEMINATION
AND INDUSTRIAL
SOLID PROPULSION, INC. IT IS DISCLOSED HEREWITH ONLY FOR THE PURPOSE OF
OF THIS INFORMATION IN ANY FORM TO ANYONE FOR ANY OTHER PURPOSE IS PROHIBITED WITHOUT THE
EXPRESS WRITTEN PERMISSION OF THE PRESIDENT OF AEROTECH, INC., OR INDUSTRIAL SOLID PROPULSION,
INC. DISCLOSURE OF THIS INFORMATION WITHOUT AUTHORIZATION MAY BE A VIOLATION OF THE TRADE
SECRETS ACT, 18 USC 1905 AND UNAUTHORIZED DISCLOSURE MAY BE SUBJECT TO CIVIL AND CRIMINAL
PENALTIES UNDER THE FEDERAL TORT CLAIMS ACT, 28 USC 1346 (B).
1955 South Palm Street • Suite 15 • Las Vegas, Nevada 89104 • (702) 641-2301

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1998/980366.pdf>
- Source ID: `phmsa`
- SHA-256: `f6e5113bc785deb0b13d5c0641e7f2d0a49759bde396bc05d205b96b1710d753`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T01:07:16.776Z
- Document slug: `phmsa-interpretation-98-0366`

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