Which NFPA health rating indicates very short exposure could cause death or major residual injury?
Blue: Health Hazard 4 – Materials with an oral LD50 of less than or equal to 5 mg/kg – Material that on very short exposure could cause death or major residual injury. Example: hydrogen cyanide.
What does Level 4 reactive hazards indicate?
Reactivity. ◆ Level 4 – Materials that are easily capable of explosive decomposition at normal temperatures and pressure. ◆ Level 3 – Materials that are easily capable of explosive decomposition, but require an ignition source or will react explosively with water.
What do NFPA 704 symbols tell you?
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 the HMIS rating mean?
Hazardous Materials Identification System
HMIS III (Hazardous Materials Identification System) is a rating system developed by the American Coatings Association, which categorizes a chemical from 0 (low hazard) to 4 (high hazard). Four areas are categorized based on health, flammability and physical hazards, as well as personal protection.
What do each of the NFPA 704 Fire diamond flammability ratings 0 4 mean?
A value of zero means that the material poses essentially no hazard; a rating of four indicates extreme danger.
How do you read fire diamonds?
Fire diamonds located on tanks and buildings indicate the level of chemical hazard located there. The four colors are blue, red, yellow, and white. The numbers superimposed over the colors rank the severity or danger, ranging from one to four, with four being the highest rating.
Is Category 1 or 4 Worse?
For gases and some reproductive toxins, the categories are listed by names rather than numbers or letters. This ranking system where 1 = the greatest hazard and 4 = the least is the exact opposite of the NFPA and HMIS® systems, and is a serious potential point of confusion for untrained workers.
What number represents the highest level of danger an NFPA 704 hazard?
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.