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What is HAZMAT? What exactly is a placard? Having the the data to describe hazardous cargo and materials is only half the task; it must be displayed in an unambiguous format that cannot be confused with other labelling and markings.  Because of this, hazmat placards are separate from the containers, vehicles and vessels they are attached to.  They are diamond shaped, like other safety-related signs on roadways and in the workplace.  Their color is related to the most significant hazard they present.  For example, while gasoline is poisonous, its flamability poses the most immediate threat, so gasoline placards are bright red. Back    Show the whole article        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)