Lab Safety

Standard Fire Symbol

National Fire Protection Association (NFPA)

The NFPA uses a symbol system designed as a diamond-shaped label containing four differently colored squares. A number (0 - 4) or an abbreviation is added to each square indicating the order of hazard severity. The higher the number, the greater the hazard.

Red Background
Flammability
  • 4 - flash point < 73 oF
  • 3 - flash point < 100 oF
  • 2 - flash point
    > 100 oF < 200 oF
  • 1 - flash point > 200 oF
  • 0 - will not burn

Yellow Background
Reactivity
  • 4 - explosive at room temp
  • 3 - shock and heat may detonate
  • 2 - violent reaction with water
  • 1 - unstable if heated, not violent
  • 0 - not reactive with water
Blue Background
Health Hazard
  • 4 - deadly
  • 3 - extreme danger
  • 2 - hazardous
  • 1 - slightly hazardous
  • 0 - normal material

White Background
Specific Hazard
  • oxidizer OX
  • acid ACID
  • alkali ALK
  • corrosive CORR
  • use NO WATER

Page last modified October 27, 2006