USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #08-0193 ([URS Corporation] [Ms. Erin N. Jarman])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: URS Corporation

Individual Name: Ms. Erin N. Jarman

Location State: NC Country: US

View the Interpretation Document

Response text:

September 2, 2008

Ms. Erin N. Jarman

Environmental Scientist

URS Corporation

1600 Perimeter Park Drive

Morrisville, NC 27560

Ref. No. 08-0193

Dear Ms. Jarman:

This is in response to your July 24, 2008 letter requesting further clarification of our letter to you dated June 20, 2008 concerning the packaging requirements for transporting non-pressurized gas under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180).

In your April 28, 2008, you asked whether shipping gas samples in "Tedlar" bags placed in a one-quart metal can (similar to a paint can) with a friction lid sealed with plastic-ring seals is permissible under the HMR. You also provided a copy of the product documentation for the friction lid metal cans indicating a hydrostatic test rating of 100kPa. In your most recent letter, you ask whether our response is the same if the hydrostatic test rating is 95 kPa instead of 100 kPa.

The answer is yes. Section 173.306(a)(4)(iii) requires non-pressurized gases, flammable to be packed in hermetically sealed glass or metal inner packagings of not more than 5 L (1.3 gallons) and overpacked in a strong outer packaging. Section 171.8 defines "hermetically sealed" as closed by fusion, gasketing, crimping, or equivalent means, so that no gas or vapor can enter or escape. It is the opinion of this Office that a metal can with a hydrostatic test rating of 95 kPa and a friction lid sealed with plastic-ring seals as described in your letter meets the definition of "hermetically sealed," and therefore can be used as an inner packaging as specified in § 173.306(a)(4)(iii).

I hope this information is helpful.


Susan Gorsky,

Acting Chief, Standards Development

Office of Hazardous Materials Standards


Regulation Sections

Section Subject
173.306 Limited quantities of compressed gases