What do the numbers mean on the NFPA 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). The bottom quadrant is used to indicate special hazards.
What do the numbers mean on hazard signs?
The four bars are color coded, using the modern color bar symbols with blue indicating the level of health hazard, red for flammability, orange for a physical hazard, and white for Personal Protection. The number ratings range from 0-4.
What is the difference in severity between number 1 and number 4 on the NFPA hazard 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 does the number 4 in the Red Diamond represent?
A four in the red indicates an extremely high ability to ignite and combust. The Yellow concerns Reactivity, or the chemical’s ability to react with other chemicals in the environment. The white indicates special precautions, usually used for oxy, or oxidizing agent.
What does white represent on the NFPA diamond?
The white diamond, appearing at the bottom of the label, conveys Special Hazard information. This information is conveyed by use of symbols that represent the special hazard.
What does a 3 in the Blue Diamond mean?
Unstable at high temperature and pressure. Reacts with water. 2-Normally unstable but will not detonate. 3-Can detonate or explode but requires strong initiating force or heating under confinement. 4-Readily detonates or explodes.
How do you read a hazard code?
How to Communicate Hazards: Hazard Statements
- Each code begins with the Letter “H” for Hazard Statement.
- The first number designates the type of hazard the hazard statement is assigned. 2 = physical hazard. 3 = health hazard. 4 = environmental hazard.
What is a hazard code?
Hazard statements are assigned a unique numerical code which can be used as a handy reference when translating labels and Safety Data Sheets written in other languages.
How do you read danger diamonds?
The number corresponds to the level of danger a chemical poses. The lower the number, the lower the hazard. The numbers range from zero to four, with zero representing no hazard at all, and four representing an extreme hazard. Each number also has a specific meaning based on which diamond it is in.
What number represents severe hazard on the National Fire Protection Association label NFPA A and what shape is the label B?
“0” indicates no hazard and “4” indicates the most severe hazard.
How do you read NFPA?
The blue section of an NFPA Fire Diamond is used to asses a material’s health hazard.
- 0 = Normal material.
- 1 = Slightly hazardous.
- 2 = Hazardous.
- 3 = Extreme danger.
- 4 = Deadly.
What does Flammability 1 mean on MSDS?
1. SLIGHT HAZARD This material must be preheated before ignition will occur. Flammable liquids in this category will have flash points (the lowest temperature at which ignition will occur) at or above 200º F (NFPA Class IIIB).
What does Level 4 flammability hazards indicate?
Risk level 4: Very flammable gases or very volatile flammable liquids. Shut off flow and keep cooling water streams on exposed tanks or containers. Risk level 3: Materials that can be ignited under almost all normal temperature conditions. Water may be ineffective because of the low flash point.
What does a 4 in flammability mean?
Flammability. ◆ 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.