Material Specifically Identified

Assign any material specifically identified and listed in Table A4.1 using the hazard class identified in Column 3. Use the classification tools identified in A4.2.1 to determine the appropriate hazardous material description.

If required, classify a hazardous material that is not specifically identified and listed in Table A4.1 (or a mixture of materials) but meets the definition of more than one hazard, according to the following order of precedence:

• Class 7 Radioactive material, except when limited quantities are involved; then, the other hazardous properties take precedence.
• Class 1 Explosives
• Class 2.3 Poisonous gas
• Class 2.1 Flammable gas; see also Class 9
• Class 2.2 Non-flammable gas; see also Class 9
• Class 5.2 Organic peroxide
• Class 6.2 Infectious substances and etiologic agents
• Class 4.1 Flammable solids, but only self- reactive substances and wetted explosives
• Class 4.2 Substances liable to spontaneous combustion, but only pyrophoric substances
• Class 6.1 Poisonous substances, PG I, poisonous by inhalation only

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