Analía Bellizzi – Chemistry Classes

Ronald Reagan Senior High School

AS Safety Symbols

Besides the safety rules and the safety contract you and your parents signed, you will be asked to recognize the most important safety symbols we can find in a lab, worksheet,  or a chemical container.

The whole list of signs you should be familiar is in your book or you can find many internet sites that show them in detail.

The next are the mandatory ones you should know:


General Warning

It means “Be careful”, Take precautions”


are biological substances that pose a threat to the health of living organisms, primarily that of humans. This can include medical waste or samples of a microorganism, virus or toxin (from a biological source) that can affect human health (a biological contamination). It can also include substances harmful to animals.


Chemicals with this label can burn your skin and eyes and burn holes in your clothes. An example is hydrochloric acid.


Chemicals with this label are damaging to the environment. An example is CFC’s.


Chemicals with this label explode easily. An example is lead azide.

Use Googles or Eye Protection

You will find this symbol together with another ones. It means that you should use goggles when handling those chemicals

 Flammable or  Open Fire

Chemicals with this label can catch fire easily. Example: methanol


Chemicals with this label cause irritation to your eyes and skin. An example is hydrogen peroxide.

   High Voltage

High voltage may be present in that area. You should be careful on handling materials in that zone.

  Hot Surface 

You should use gloves or another protection when approaching to a hot surface

Low Temperature 

This symbol is used when low temperatures are present that can harm your skin or tissue.


Chemicals with this label contain oxygen that may cause other materials to combust. An example is potassium dichromate.

 Poison / Toxic

Chemicals with this label are highly toxic. An example is mercury. The difference between poisonous and toxic is that the lethal dose of poison is smaller than the lethal dose of a toxic material.


These substances are radioactive. Radiation can damage cells and cause cancer.

Radiofrequency (RF)

This sign shows that some equipment is emitting electromagnetic waves. This is also called NON IONIZING RADIATION