Calcium oxide

OSHA PEL: TWA 5 mg/m³
ACGIH TLV: TWA 2 mg/m³
DFG MAK: 5 mg/m³
DOT Classification:  8; Label: Corrosive

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Calcium oxide, its cas register number is 1305-78-8. It also can be called Airlock Bell CML(E); Bell CML(P); Burnt lime; CALX; CCRIS 7496; CML 21; CML 31; CML 35; Calcia; Calcia (CaO); Calcium monoxide; Calcium oxide;. Calcium oxide(CAS NO.1305-78-8) is commonly known as burnt lime, lime or quicklime, which is a widely used chemical compound. It is a white, caustic and alkaline crystalline solid at room temperature. As a commercial product, lime often also contains magnesium oxide, silicon oxide and smaller amounts of aluminium oxide and iron oxide. The name lime (native lime) refers to a very rare mineral of the CaO composition.

Preparatinon of Calcium oxide: Calcium oxide is usually made by the thermal decomposition of materials such as limestone, that contain calcium carbonate (CaCO₃; mineral calcite) in a lime kiln. This is accomplished by heating the material to above 825 °C (1,517 °F), a process called calcination or lime-burning, to liberate a molecule of carbon dioxide (CO₂); leaving quicklime.

Uses of Calcium oxide: Calcium oxide (CAS NO.1305-78-8) is used in water and sewage treatment to reduce acidity, to harden, as a flocculant and a coagulant, and in bleaching; in agriculture to improve acidic soils; and in pollution control, in gas scrubbers to desulfurize waste gases and to treat many liquid effluents. It is also used in the metallurgical industry as a flux in the manufacture of steel.

When you are using this chemical, please be cautious about it as the following:
1. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice;
2. Wear suitable protective clothing, gloves and eye/face protection;
3. In case of accident or if you feel unwell, seek medical advice immediately (show label where possible);
4. Avoid contact with eyes;
5. Wear eye/face protection;

You can still convert the following datas into molecular structure:
(1)InChI=1S/Ca.O;
(2)InChIKey=ODINCKMPIJJUCX-UHFFFAOYSA-N;
(3)SmilesO=[Ca];