This hazmat diamond guide identifies NFPA 704 hazard ratings and symbols, including special hazards for acidic, oxidizing or radioactive materials. Use it to help workers understand hazmat diamonds found on the materials they handle. Our permanent labels have easy-to-remove backing and are UV, chemical, abrasion and moisture resistant. They have permanent adhesive and are suitable for use at temperatures from -40 to +176 F. ComplianceSigns.comlabels are made in the USA and commonly used in industrial, commercial, public and private settings. Full text: NFPA Rating Explanation Guide HEALTH HAZARD FLAMMABILITY HAZARD SPECIAL HAZARD INSTABILITY HAZARD 4 = Can be lethal 3 = Can cause serious or permanent injury 2 = Can cause temporary incapacitation or residual injury 1 = Can cause significant irritation 0 = No hazard 4 = Will vaporize and readily burn at normal temperatures 3 = Can be ignited under almost all ambient temperature 2 = Must be heated or high ambient temperature to burn 1 = Must be preheated before ignition can occur 0 = Will not burn 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