What are the four categories embodied in NFPA 704?

The National Fire Association (NFPA) has developed a color-coded number system called NFPA 704. The system uses a color-coded diamond with four quadrants in which numbers are used in the upper three quadrants to signal the degree of health hazard (blue), flammability hazard (red), and reactivity hazard (yellow).

What does 4 represent in the NFPA 704 Diamond?

Number System: NFPA Rating and OSHA’s Classification System 0-4 0-least hazardous 4-most hazardous 1-4 1-most severe hazard 4-least severe hazard • The Hazard category numbers are NOT required to be on labels but are required on SDSs in Section 2. … Acute hazards are more typical for emergency response applications.

What 4 hazards are classified on the NFPA 704 Diamond?

The system addresses the health, flammability, instability, and special hazards presented from short-term, acute exposures that could occur as a result of a fire, spill, or similar emergency.

What does 4 mean on the NFPA?

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) RATING SYSTEM

Level 4 – Materials that can affect health or cause serious injury, during periods of very short exposure, even though prompt medical treatment is given.

What are the major regions of the NFPA 704 fire diamond?

The four divisions are typically color-coded with red on top indicating flammability, blue on the left indicating level of health hazard, yellow on the right for chemical reactivity, and white containing codes for special hazards.

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What are the four colors of the risk diamond?

The system uses a color-coded diamond with four quadrants in which numbers are used in the upper three quadrants to signal the degree of health hazard (blue), flammability hazard (red), and reactivity hazard (yellow).

What are the 9 DOT hazard classes?

A visor card guide for state and local law enforcement officials illustrating vehicle placarding and signage for the following nine classes of hazardous materials: 1) Explosives, 2) Gases, 3) Flammable Liquid and Combustible Liquid, 4) Flammable Solid, Spontanaeously Combustible and Dangerous When Wet 5) Oxidizer and …

Is the NFPA diamond still used?

Their answer: Yes, OSHA will continue to allow NFPA and/or HMIS rating systems on labels and SDSs as supplemental information. However, the rules for labeling and placement on the SDSs still apply. See below for a detailed discussion on how one can use NFPA and/or HMIS rating systems on labels and SDSs.

What does a 4 in flammability mean?

Level 4 – Materials that completely vaporize at normal pressure and temperature and burn readily. ◆ Level 3 – Liquids and solids that can be ignited under the most ambient conditions. ◆ Level 2 – Materials that must be moderately heated before ignition can occur.

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