There are five types of hazardous materials.
Ignitability
Creates fire under certain conditions, spontaneously combustable or has a flash point less than 140F (60C).
Corrosivity
Acids or bases that can corrode metal tanks, drums, or other containers. They have a pH less than or equal to 2 or greater than or equal to 12.5.
Reactivity
These waste materials are unstable under normal conditions. They can cause explosions, toxic fumes, gases, or vapors if heated, compressed, or mixed with water.
Toxicity
Use litmus paper to test for Reactivity