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CLASSIFICATIONS AND HANDLING OF DANGEROUS SUBSTANCES Dangerous materials are having specific physical or chemical properties that could lead to potential hazard to human safety and health if not controlled properly.Hydrogen Peroxide and Lead Nitrate are examples of this category.Many of the are reactive and are liable to heating up. Three subcategories of flammable solids are Class 4.1 - Flammable solids that burns and decompose explosively and emits toxic gases, Class 4.2 - Spontaneous Combustible that react quickly with oxygen, Class 4.3

• dangerous when wet as they react with water producing flammable gases that could be ignited by the heat.Most of them are dangerous as they affect the human metabolism or react with oxygen and would result in the release of toxins and poisonous substances Class 3: Flammable Liquids - Flammable liquids are combustible at low temperatures and encounters huge risk of exposing to ignitions Class 4: Flammable Solids - Flammable solids are dangerous as they are easily combustible while transporting.Calcium carbide on contacting with water produces acetylene gas which is easily combustible is an example of this category.

CLASSIFICATIONS AND HANDLING OF DANGEROUS SUBSTANCES
Dangerous materials are having specific physical or chemical properties that could lead to
potential hazard to human safety and health if not controlled properly. They are classified and
identified in terms of the harm they might cause and most of them fall in more than one category.
Generally, they fall in any of the classifications: Flammable or Explosive, Irritant, Harmful,
Toxic, Corrosive, agents of anoxia, Oxidizing agents, Narcotics and Carcinogens. They are
classified into nine classes depending on the danger present with them.
Class 1: Explosives – explosives are capable of rapid release of huge amount of energy that could
be harmful for people, infrastructure and environment
Class 2: Gases – Gases include flammable, inflammable and toxic which are either compressed
refrigerated or liquified. Most of them are dangerous as they affect the human metabolism or react
with oxygen and would result in the release of toxins and poisonous substances
Class 3: Flammable Liquids – Flammable liquids are combustible at low temperatures and
encounters huge risk of exposing to ignitions
Class 4: Flammable Solids – Flammable solids are dangerous as they are easily combustible while
transporting. Many of the are reactive and are liable to heating up. Three subcategories of
flammable solids are Class 4.1 - Flammable solids that burns and decompose explosively and
emits toxic gases, Class 4.2 – Spontaneous Combustible that react quickly with oxygen, Class 4.3
– dangerous when wet as they react with water producing flammable gases that could be ignited
by the heat. Calcium carbide on contacting with water produces acetylene gas which is easily
combustible is an example of this category.
Class 5: Oxidizing Agents (5.1) and Organic Peroxides (5.2) – They are extremely reactive due
to the high oxygen content and may lead to fire especially in confined spaces. Hydrogen Peroxide
and Lead Nitrate are examples of this category.
Class 6: Toxins and Infectious substances – Toxins are substances causing harm to human health
and they enter our body through breathing, absorption through skins etc. Infectious substances
are containing microorganisms that causes diseases for humans and live stocks
Class 7: Radioactive Material – They emits harmful radiations spontaneously with the release of
energy. They possess huge potential of existence of human life if not handled carefully.