Hazardous Substances

Hazardous Substances and Their Symbol

  1. Hazardous substances are solids, liquids, or gases that can harm people, other living organisms, property, or the environment.
  2. In laboratory, hazardous substances are labelled with hazard symbol.
  3. Hazard symbols are recognizable symbols designed to warn about hazardous materials, locations, or objects, including electric currents, poisons, and other things.
  4. Below are the hazard symbol that you may see in a laboratory.


Substances that can burn easily.
Example: Petrol, kerosene, alcohol, ether


A corrosive substance is one that will destroy and damage other substances with which it comes into contact.
Example: Concentrated acids and alkalis, bromine water


Substances that can explode easily
Example: Sodium, potassium


Poisonous substances are substances that cause disturbances to organisms, usually by chemical reaction when a sufficient quantity is absorbed by an organism.
Example: Bromine, chlorine, mercury


Irritants are substances that can cause rashes and discomfort to the body.
Example: Bromine, ammonia, sulphur dioxide


Radioactive substances are substances that emit radioactive radiation.

Example: Uranium, plutonium, radium


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