What types of hazardous materials are subject to placarding?
There are 9 hazardous material classes identified as requiring placards during transportation. Class 1 – Explosives 1.1 – Mass Explosion 1.2 – Projection Hazard 1.3 – Fire-minor balst or projection 1.4 – Minor explosion 1.5 – Insensitive, remote mass explosion 1.6 – Insensitive, no mass explosion Class 2 – Gases 2.1 – Flammable gas 2.2 – Compressed Gas > 280 kPa (not flammable or toxic) 2.3 – Toxic Gas (LC50 < 5000 mL/m3 Class 3 - Flammable Liquids (Flashpoint <141 F) Class 4 - Flammable Solids 4.1 - Fire by friction, self reactive 4.2 - Spontaneously combustible (ignites upon contact with air) 4.3 - Dangerous when wet (in contact with water gives off flammable gas) Class 5 - Oxidizers 5.1 - Oxidizers (produce oxygen, increases combustion) 5.2 - Organic Peroxide (thermally unstable, burns rapidly) Class 6 - Toxic 6.1 - Poisonous (LD50 or LC50 –mg/kg) 6.2 - Infectious substances (causes disease in animals or humans) Class 7 - Radioactive (exposure or contamination causes illness) Class
