Chemical substances are rated for degree of HEALTH RISK (blue diamond), FLAMMABILITY (red diamond), REACTIVITY (yellow diamond), on a scale of 0 to 4. The white diamond is used to indicate the presence of large quantities of chemicals possessing unusual water reactivity (W) or oxidative capability (oxy).
Which NFPA symbol indicates health risk?
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).
Which section of an NFPA 704 label indicates health hazards?
Codes. 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.
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 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 …
What are the 9 hazard symbols?
Hazard pictograms (symbols)
- Explosive (Symbol: exploding bomb)
- Flammable (Symbol: flame)
- Oxidising (Symbol: flame over circle)
- Corrosive (Symbol: corrosion)
- Acute toxicity (Symbol: skull and crossbones)
- Hazardous to the environment (Symbol: environment)
What are the 4 hazard categories?
|Hazard Class||Associated Hazard Category|
|Gases under pressure||4 Groups include: Compressed gas, Liquefied gas, Dissolved gas, and Refrigerated liquefied gas|
|Flammable liquids||Categories 1 – 4|
|Flammable solids||Categories 1 and 2|
|Self-reactive substances||Types A-G|
What is full form of NFPA?
National Fire Protection Association (NFPA) is a United States trade association established in 1896, is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating consensus codes and standards, research, training, and education.
Are NFPA diamonds required?
NFPA 704 labels are required when another Federal, state or local regulation or code requires their use. NFPA 704 does not specify when a container, tank or facility must label with the 704 diamond.
What does a reactivity rating of 4 mean?
Instability (Yellow) (Reactivity)
4 Danger- Explosive material at room temperature. 3 Danger – May be explosive if shocked, heated under confinement, or mixed with water. 2 Warning – Unstable or may react violently if mixed with water.
What is the most severe NFPA hazard rating?
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.
What is a Category 4 flammable liquid?
Category 4 shall include liquids having flashpoints above 140 °F (60 °C) and at or below 199.4 °F (93 °C).