Test Procedures and Classification Criteria for Release of Toxic Gases from Water-Reactive Materials

Water-reactive substances, which are defined in international regulations as substances that, in contact with water, release flammable gases, are assigned to U.S. Department of Transportation (USDOT) Hazard Class 4.3. The gases released may also be highly toxic. For instance, ferrosilicon, when in contact with water, releases arsine and phosphine gases. The test procedures and classification criteria for Hazard Class 4.3 are inadequate. For example, the procedures and criteria do not take into account (1) water reactions that may lead to the release of toxic gases, (2) the quantity of water-reactive substances being shipped, or (3) the potential effect of water salinity on release of toxic gases. The objective of this research is to propose existing, new, or enhanced test procedures and classification criteria for water-reactive materials (WRMs) that take account of the potential release of toxic gases during transport. In this research, the term water-reactive material is defined as a solid or liquid that may give off toxic gases when exposed to water during transport. This term may include (1) materials presently included in Hazard Class 4.3; (2) other regulated materials reactive to water, such as sulfur chloride; and (3) currently unregulated materials that are reactive to water


  • English


  • Status: Proposed
  • Funding: $300000.00
  • Contract Numbers:

    Project HM-14

  • Sponsor Organizations:

    Pipeline and Hazardous Materials Safety Administration

    U.S. Department of Transportation
    East Building, 2nd Floor 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    Hazardous Materials Cooperative Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001
  • Project Managers:

    Harrigan, Edward

  • Start Date: 20111214
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 29137

Subject/Index Terms

Filing Info

  • Accession Number: 01463229
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project HM-14
  • Files: TRB, RiP, USDOT
  • Created Date: Jan 3 2013 2:20PM