Group A and B incompatible chemicals list

Group A

Group B

Group 1-A

  • Bases
  • Potential consequences:  Heat generation; violent reaction

Group 1-B

  • Acids

Group 2-A

  • Aluminum
  • Beryllium
  • Calcium
  • Lithium
  • Magnesium
  • Potassium
  • Sodium
  • Zinc powder
  • Other reactive metals and metal hydrides
  • Potential consequences: Fire, Explosion, or generation of flammable hydrogen gas.

Group 2-B

  • Any Acid or Bases

Group 3-A

  • Alcohols
  • Water
  • Potential consequences: Fire, Explosion, or heat generation:
    generation of flammable or toxic gases.
 Group 3-B
  • Any Concentrated Acids or Bases
  • Calcium
  • Lithium
  • Magnesium
  • Sodium
  • Zinc Powder
  • Any Reactive Metals and Metal Hydrides
  • Potassium
  • Sulfonyl chloride
  • Thionyl chloride
  • Phosphorus trichloride
  • Methyl trichloride
  • Methyl trichlorosilane
  • Other water-reactive waste

Group 4-A

  • Alcohols
  • Aldehydes
  • Halogenated hydrocarbons
  • Nitrated hydrocarbons
  • Unsaturated hydrocarbons
  • Other organic compounds and solvents
  • Potential consequences:  Fire, Explosion, or violent reaction.

Group 4-B

  • Any Concentrated Acids or Basses
  • Reactive Metals and Metal Hydrides

Group 5-A

  • Cyanide's and sulfide's
  • Potential consequences:  Generation of toxic hydrogen cyanide or hydrogen sulfide gas.

Group 5-B

  • Any Acids

Group 6-A

  • Chlorates
  • Chlorine
  • Chlorites
  • chromic acid
  • Hypochlorites
  • Nitrates
  • Nitric acid, fuming
  • Perchlorates
  • Permanganates
  • Peroxides
  • Other strong oxidizers
  • Potential consequences:  Fire, Explosion, or violent reaction.

Group 6-B

  • Acetic acid and other organic acids
  • Concentrated mineral acids
  • Reactive Metals and Metal Hydrides
  • Organic Compounds and Solvents
  • Other flammable and combustible chemicals

The following two groups are added to facilitate the economical disposal of the wastes.  They are not necessarily reactive.

Group 7-A

  • Heavy metal Compounds containing arsenic, barium, cadmium, chromium, lead, selenium, silver
  • Polychorlinated biphenyls (PCBs) Dioxins
  • Mercury Containing Compounds

Group 7-B

  • Flammable Liquids

Group 8-A

  • Polychlorinated biphenyls (PCBs)
  • Dioxins
  • Mercury Containing Compounds

Group 8-B

  • All other chemicals and each other