In order to bring you the best possible user experience, this site uses Javascript. If you are seeing this message, it is likely that the Javascript option in your browser is disabled. For optimal viewing of this site, please ensure that Javascript is enabled for your browser.
[Header] PHMSA - U.S. Department of Transportation - Pipeline and Hazardous materials Safety Adminis
Advanced Search
PHMSA Home
Hazard Division
Hazmat Term
A means of sub-dividing similar hazardous materials which require different hazard communications.
Careers  |  Contact Us  |  No Fear  |  Privacy Policy  |  FOIA  |  Accessibility  |  FAQs  |  Web Policies  |  Site Map  |  Download Acrobat