NFPA Rating Explanation Guide Rating Number Health Hazard Flammability Hazard Instability Hazard Rating Symbol Special Hazard 4 Can be lethal Will vaporize and readily burn at normal temperatures May explode at normal temperatures and pressures 3 Can cause serious or permanent injury Can be ignited under almost all ambient temperature May explode at high temperature or shock 2 Can cause temporary incapacitation or residual injury Must be heated or high ambient temperature to burn Violent chemical change at high temperatures or pressures 1 Can cause significant irritation Must be preheated before ignition can occur Normally stable. High temperatures make unstable 0 No hazard Will not burn Stable OX Oxidizing SA Simple asphyxiants W Reacts violently or explosively with water This chart for reference only - for complete specifications consult the NFPA 704 Standard
NFPA 704 Hazard Diamond Explanation Guide
The National Fire Protection Agency (NFPA), in section 704 of the National Fire Code, specifies a system for identifying hazards associated with various materials. Proper identification of such hazards is essential for anyone who needs to handle such materials, and emergency responders. This surface-mount NFPA Rating Explanation Guide will do the job.
Surface-mount sign is printed in multiple colors and is UV, chemical, abrasion and moisture resistant.
- Rugged, enamel-coated aluminum
- Semi-rigid PVC plastic
- Flexible vinyl label stock with permanent adhesive (Choose a tab next to the sign to select material and size)
Aluminum and PVC signs have 0.20-in. mounting holes in each corner.
All are printed with UV-stable ink and are suitable for indoor or outdoor use at service temperatures from -40 F to +180 F.
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