Registration Dossier
Registration Dossier
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EC number: 231-179-5 | CAS number: 7440-70-2
Endpoint summary
Administrative data
Description of key information
Additional information
Calcium is a soft, gray/silvery alkaline earth metal. It is the lightest of the alkali earth metals with a density of 1.54 g/cm3. It is also the fifth most abundant element by mass in the earth's crust. However, due to its reactivity it is not naturally found in its elemental state. When exposed to air it rapidly forms oxide (CaO) and nitride (Ca2N3). Ca-metal reacts with water, evolving hydrogen gas. In powdered form the reaction with water is extremely rapid. In the Ca-water reaction calcium dihydroxide (Ca(OH)2) is formed. In accordance with Annex VI to Regulation (EC) No 1272/2008 (lists of harmonised classification and labelling), calcium has been classified as follows: Hazard class and category codes: Water React. Flam. Gas 2 (highly flammable and water reactive substance, which violently reacts with water forming flammable gas).
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