NFPA or Fire Rhombus is an international standard for chemicals related to health and hygiene, fire extinguishing, reactivity and special symbols so that we can easily remember the level of danger of each chemical in various conditions.

NFPA hazard rhombus components

This rhombus consists of four rhombus-shaped parts, each of which is distinguished in terms of color, location and symbol (numerical or textual). Risk numbers vary and are categorized from 0 (no risk) to 4 (extreme risk).

Blue rhombus:

This diamond indicates the health hazard number of a surface chemical that can cause harm to a person through inhalation, skin or eye contact, or ingestion.

4.Deadly

3.Dangerous

2.Severe chemical changes

1.With medium risk

0.Normal

Red rhombus:

This rhombus indicates the risk of flammability of chemicals with the degree of sensitivity of a substance to burn.

4.Below 73 degrees Fahrenheit

3.Below 100 degrees Fahrenheit

2.Below 200 degrees Fahrenheit

1.Above 200 degrees Fahrenheit

0.It does not burn

Yellow rhombus:

This rhombus indicates the risk of instability of a chemical substance. This rhombus shows the degree of reaction with ambient air, light or both and the degree of inherent sensitivity of the material to release energy by itself and the reaction.

The numbers of this rhombus are used to determine the following:

4.It may explode.

3.It may explode due to heat and shock.

2.Severe chemical changes.

1.It is unstable against heat.

0.It is stable.

White rhombus:

The white area of ​​the fire rhombus can contain one of several special notification symbols that have special meanings, which include:

Oxidizer OX

Acidity of ASID

Alkaline ALK

Corrosive COR

due to mixing with water