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 #99-0177 ([DELTA Analytical Corporation] [Mr. Jeff Jones])

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

Interpretation Response Details

Response Publish Date:

Company Name: DELTA Analytical Corporation

Individual Name: Mr. Jeff Jones

Location State: MD Country: US

View the Interpretation Document

Response text:

October 7, 1999


Mr. Jeff Jones                                    Ref. No. 99-0177
DELTA Analytical Corporation
7910 Woodniont Avenue, Suite 1000
Bethesda, Maryland 20814

Dear Mr. Jones:

This is in response to your letter dated July 2, 1999, regarding whether a 1991 letter of interpretation, written to The Clorox Company, is correct that sodium hypochlorite solutions containing 7% available chlorine is not corrosive, and not subject to the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180).

The letter issued to Mr. Fred Schaefer of the Clorox Company in 1991 was based specifically on data presented by Mr. Schaefer for specified products.  This letter may not be valid for other products because the composition (formulation) of hypochlorite solutions may vary from one product to another.  The corrosive properties for products containing hypochlorite depend on the concentration of hypochlorite as well as the presence of other ingredients.  Therefore, an evaluation of each formulation against the definition and criteria for Class 8 (corrosive) material defined in 49 CFR 173.136 and 173.137 is necessary.  This task is the responsibility of the offeror (shipper) as required in 49 CFR 173.22. This Office does not perform that function.

In a final rule published in the Federal Register on December 21, 1990, the HMR was aligned with international standards based on the U.N. Recommendations.  The U.N. criteria for corrosive material were adopted, and the ORM-B (Other Regulated Material, category B) hazard class was eliminated.  The definition of corrosive material has not changed under the HMR.  However, since 1991 "Packing Groups" (i.e., I, IIand III), which is a grouping according to the degree of danger presented by the hazardous material, were adopted to determine appropriate packaging for corrosive materials in transportation in commerce. [HM-181; 55 FR 52402, as amended in 56 FR 66124; 12/20/91]

I hope this satisfies your inquiry.  If we can be of further assistance, please contact us.



Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
172.101 Purpose and use of hazardous materials table