Hazardous materials are classified using the United Nations Identification (UN ID) numbering system. The UN ID numbers are 4 digits long.
Hazardous materials are the substances that can cause harm either to the human health or to the environment. They have to be treated very carefully by taking precautions.
United Nations Identification (UN ID) numbering system is a four digits numbering system that includes a list of hazardous material whose transports is covered under the framework of international transport.
Such materials include explosives, flammable liquids, oxidizers, toxic liquids, etc.
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