On the NFPA 704 fire diamond 4 is the most severe rating in the flammability, health and reactivity division.
A numerical scale from 0 to 4 is used in the blue, red, and yellow areas (health, flammability, and reactivity).
A value of zero denotes that the substance is practically risk-free, whereas a grade of four denotes serious danger.
<h3>What is NFPA?</h3>
The National Fire Protection Association is a global nonprofit organization whose mission is to end economic, physical, and other losses caused by electrical, fire, and related risks.
When a small group of concerned professionals first convened in Boston in 1896 to discuss the disparities in fire sprinkler system design and installation.
This was the beginning of the NFPA's process for creating codes and standards.
In an effort to reduce the likelihood and consequences of fire and other risks, the NFPA produces more than 300 consensus rules and standards.
The world adopts and uses NFPA rules and standards, which are managed by more than 250 Technical Committees made up of over 8,000 volunteers.
