Here's a breakdown:
1. Hazard Classes:
The GHS defines 16 hazard classes, encompassing different types of hazards:
* Physical Hazards:
* Explosives (EX): Substances and mixtures that can explode under certain conditions.
* Flammable Liquids (FL): Liquids that easily ignite and burn.
* Flammable Solids (FS): Solids that easily ignite and burn.
* Flammable Gases (FG): Gases that easily ignite and burn.
* Oxidizing Liquids (OL): Liquids that can cause or contribute to the combustion of other materials.
* Oxidizing Solids (OS): Solids that can cause or contribute to the combustion of other materials.
* Self-Heating Substances (SH): Substances that can heat up spontaneously under certain conditions.
* Pyrophoric Liquids (PYL): Liquids that ignite spontaneously in air.
* Pyrophoric Solids (PYS): Solids that ignite spontaneously in air.
* Self-Reacting Substances (SR): Substances that can undergo a strongly exothermic reaction without external energy input.
* Organic Peroxides (OR): Organic compounds containing the -O-O- group that can be highly reactive.
* Corrosive to Metals (CM): Substances that can damage metals through chemical reactions.
* Health Hazards:
* Acute Toxicity (AC): Substances that can cause serious health effects after a single exposure.
* Skin Corrosion/Irritation (SK): Substances that can cause skin burns or irritation.
* Serious Eye Damage/Eye Irritation (EI): Substances that can cause serious eye damage or irritation.
* Respiratory Sensitizer (RS): Substances that can cause allergic respiratory reactions after repeated exposure.
* Skin Sensitizer (SS): Substances that can cause allergic skin reactions after repeated exposure.
* Germ Cell Mutagenicity (GM): Substances that can cause mutations in germ cells, which may lead to heritable genetic defects.
* Carcinogenicity (CA): Substances that can cause cancer.
* Reproductive Toxicity (RT): Substances that can affect fertility or cause developmental problems in the unborn child.
* Specific Target Organ Toxicity - Single Exposure (STOT SE): Substances that can cause health effects after a single exposure, affecting specific organs.
* Specific Target Organ Toxicity - Repeated Exposure (STOT RE): Substances that can cause health effects after repeated exposure, affecting specific organs.
* Aspiration Hazard (AS): Substances that can cause lung damage if aspirated into the lungs.
2. Categories:
Within each hazard class, there are categories to further define the severity of the hazard. For instance, flammable liquids are categorized by their flash point (the temperature at which they ignite). The higher the flash point, the less flammable the liquid.
3. Signal Words:
The GHS uses signal words to communicate the level of hazard:
* Danger: Indicates a severe hazard, requiring immediate action.
* Warning: Indicates a moderate hazard, requiring caution.
4. Hazard Statements (H-Statements):
H-statements provide specific information about the hazards of a chemical. Each statement describes a particular hazardous property and its potential consequences.
5. Precautionary Statements (P-Statements):
P-statements offer guidance on how to safely handle and use a chemical. They outline specific measures to mitigate the risks associated with the identified hazards.
Overall, the GHS aims to provide a clear and consistent system for classifying and labeling chemicals, enhancing safety and reducing risks for workers, consumers, and the environment.
