Storage Groups are groups of chemicals that will not react violently if mixed together. Storage Group identifiers (A-X) are assigned to each chemical. Storage Group identifiers are used for: storing solids, liquids and gases; grouping hazardous chemicals in the same secondary containment tray, including Hazardous Waste; and determining the appropriate re-use of empty chemical containers. Never store chemicals from different Storage Groups in the same secondary container. A Compatible Organic Bases, Flammables, and Poisons. B Pyrophoric and Water Reactive Materials. C Compatible Inorganic Bases, Oxidizers, and Poisons. D Compatible Organic Acids, Flammables, and Poisons. E Compatible Oxidizers, Organic Peroxides, and Acids. F Inorganic Acids not including Oxidizing or Organic Acids. G Non-Reactive Materials and Non-Hazardous Materials. H Flammable or Pyrophoric Compressed Gases. I Compatible Corrosive and Oxidizing Gases and Inert Gases. J Poison Compressed Gases. K Explosive or other unstable material. L Solvents, Flammables, and Combustible Materials. X Needs secondary containment separate from ALL groups and from each other individually. Storage Groups that can be stored on the same shelf, or within the same storage cabinet, if each Group is segregated by secondary containment: SHELF STORAGE GROUP 1 A, B, D, G, L 2 C, E, F, G 3 X [store separately] E. INCOMPATIBLE CHEMICALS Violent reactions may occur when the following chemicals from different Storage Groups are mixed: Corrosives + Flammables = Explosion/Fire Corrosives + Poisons = Poison Gas Flammables + Oxidizers = Explosion/Fire Acids + Bases = Corrosive Fumes/Heat F. SECONDARY CONTAINMENT Use secondary containment to separate incompatible chemicals. Secondary containers: must be used for ALL liquid chemicals; for a single container, must be sized to contain 110% of the single containers capacity; for multiple containers stored in the same secondary container: the secondary container must be able to contain 150% of the largest container or 10% of the aggregate quantity stored, which ever is greater; must be capable of holding any spilled material until the spill can be cleaned up; must not be degraded by the spilled material (i.e.: the secondary container must be compatible with the hazardous material).