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What is HAZMAT? Finally: Where are HazMat Markings used? HazMat markings are placed on all vertical sides of their associated container or vehicle in accordance with United States Code of Federal Regulations (CFR) 49.172.101 and enforced by the federal Department of Transportation, state and local law enforcement agencies.  CFR 49.172.101 is harmonized by international agreements so that markings on cargo originating in the U.S. will be compatible with those outside the U.S.A. Back    Show the whole article    Home     There are several basic classes of HazMat in common use: Click to see the list1.x   Explosive2.1   Flammable Gas2.2   Non-Flammable Gas2.3   Poison Gas3     Flammable Liquid4.1   Flammable Solid4.2   Spontaneously Combustible4.3   Dangerous When Wet5.1   Oxidizer5.2   Organic Peroxide6.1   Poison6.2   Infectious substance7     Radioactive8.1   Corrosive, Acid8.2   Corrosive, Alkali9     Class 9 Also, see our Hazmat Code page References: o Bureau of Explosives of the Association of American Railroads o United States Fire Administration Hazardous Materials Guide for First Responders      (Search from the HSDL homepage -- no direct link) o United Nations Economic Commission for Europe (UNECE) o UNECE UN Codes o U.S. DOT CFR 49.172.101 (para 172.332, page 378-379)