Hazard Class 4
Class 4Flammable solids, Spontaneously combustible materials, and Dangerous when wet materials
Division 4.1Flammable solids
Division 4.2Spontaneously combustible materials
Division 4.3Dangerous when wet materials
Dangerous 4 DOT Placard
  • Division 4.1 Flammable solids. Flammable solids include materials other than explosives that are likely to cause fire by self-ignition through friction, absorption of moisture, spontaneous chemical changes, or as a result of heating.
  • Division 4.2 Spontaneously combustible materials.
  • Division 4.3 Dangerous when wet materials.