Water reactive
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A water reactive substance is one that spontaneously undergoes a chemical reaction with water... Notable examples include the alkali metals, sodium through caesium.
Water reactive substances are classified as R2 under the UN classification system and as Hazard 4.3 by the United States Department of Transportation.
Some water reactive substances are also pyrophoric.
Some of the metals that are reactive with water are Lithium, Sodium, Potassium, Rubidium and Caesium. These metals are usually stored in containers with oil so that if any water is brought into the container, it and the oil will separate, protecting the metal.
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