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Interpretation Response #99-0097 ([Mr. Mark Villarino])

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

Interpretation Response Details

Response Publish Date:

Company Name:

Individual Name: Mr. Mark Villarino

Location State: CA Country: US

View the Interpretation Document

Response text:

May 25,1999


Mr. Mark Villarino                       Reference No. 99-0097
Hazard Communication Specialist
14422 South San Pedro Street
Gardena, CA 90248

Dear Mr.Villarino:

This is in response to your letter of April 13, 1999,regarding the basis of solution percentages under the Hazardous Materials Regulations (HMR: 49 CFR Parts 171-180). Specifically, you ask whether the concentration of sulfuric acid is based on weight/weight, volume/volume, or weight/volume.

The percentages of the sulfuric acid entries in the hazardous materials table are based on the weight of the solute to the weight of the solvent.

I hope this answers 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