Calcium

Calcium is a metallic chemical element with the symbol Ca and atomic number 20, classified as an alkaline earth metal. It has a molecular weight of 40.08 g/mol and CAS number 7440-70-2. Calcium is highly reactive, particularly with water, which classifies it as Water-react. 2 under GHS classification. In its pure metallic form, calcium appears as a silvery-white metal that tarnishes rapidly when exposed to air and moisture.

Calcium is a soft, silvery-white metallic solid at room temperature with a relatively low density of 1.55 g/cm³. It has a melting point of 842°C and boiling point of 1484°C. Calcium reacts vigorously with water to produce calcium hydroxide and hydrogen gas, making it highly water-reactive. It also oxidizes rapidly in air, forming a white oxide layer. The metal is relatively soft and can be cut with a knife.

Calcium serves as a reducing agent in the extraction of metals like thorium, uranium, and zirconium from their oxides. It is used in the production of calcium-lead alloys for battery grids and as a deoxidizer in steel manufacturing. Calcium also finds applications in the production of calcium hydride, which serves as a portable hydrogen source, and in specialized metallurgical processes where its strong reducing properties are valuable.

Calcium must be handled with extreme caution due to its water-reactive nature and flammability risk (GHS02 pictogram). Always wear appropriate personal protective equipment including safety goggles, gloves, and protective clothing. Work in a dry, well-ventilated area away from water and moisture. Use inert gas atmosphere when possible and have dry sand or specialized extinguishing agents available for fire suppression. Never use water to extinguish calcium fires.

Calcium must be stored in airtight containers under inert gas (nitrogen or argon) to prevent contact with moisture and oxygen. Store in a cool, dry location away from water sources, acids, and oxidizing agents. Use specialized storage facilities designed for water-reactive materials. Containers should be clearly labeled and stored in areas with restricted access. Regular inspection of storage containers is essential to ensure integrity and prevent moisture ingress.

Calcium exposure requires immediate action due to its reactive nature. For skin contact, remove contaminated clothing and brush off any solid particles before flushing with large amounts of water. For eye contact, rinse immediately with water for at least 15 minutes. If inhaled, move to fresh air immediately. In case of fire involving calcium, do not use water - use dry sand or specialized extinguishing agents. Seek medical attention for all exposures.

Calcium disposal must follow strict hazardous waste regulations due to its water-reactive classification. Small quantities can be carefully neutralized by controlled reaction with dry sand or inert materials under expert supervision. Larger quantities require specialized hazardous waste disposal services. Never dispose of calcium in regular waste streams or down drains. Contact licensed waste disposal companies familiar with water-reactive materials and follow local environmental regulations for proper disposal documentation.

Calcium is classified as ADR Class 4.3 (water-reactive substances) Packing Group II, requiring specialized transportation procedures. It must be packaged in UN-approved containers that prevent moisture ingress and are clearly labeled with appropriate hazard markings. Transport vehicles must carry emergency equipment and documentation. Only certified carriers experienced in handling water-reactive materials should transport calcium, following strict ADR regulations for dangerous goods transport.

Calcium is subject to various European regulations including CLP (Classification, Labelling and Packaging) requirements due to its water-reactive nature and flammability. It falls under REACH registration requirements for chemical substances. Transport is governed by ADR regulations for dangerous goods Class 4.3. Workplace exposure is regulated under occupational safety directives. However, calcium is not currently listed as a Substance of Very High Concern (SVHC) under REACH.

Calcium is available through OYSI, a European distributor specializing in technical chemicals and hazardous materials. As an experienced supplier, OYSI can provide calcium with proper documentation, safety data sheets, and compliance with European regulations. Their expertise in handling water-reactive substances ensures safe packaging and delivery. Contact OYSI directly for availability, technical specifications, and pricing information tailored to your specific industrial requirements.