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Calcium Oxide

Name: Calcium Oxide
SKU: 0

Basic Information

CAS No.: 1305-78-8
Molecular Formul: CaO
Molecular Weight: 56.08

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Product Details

Calcium oxide (CaO, CAS Reg. No. 1305-78-8) is also known as lime, quick lime, burnt lime, or calx. Lime does not occur naturally since it reacts so readily with water (to form hydrated lime) and carbon dioxide (to form limestone). It is produced from calcium carbonate, limestone, or oyster shells by calcination at temperatures of 1,700-2,450℃.

Chemical Properties

Property	Value
Melting point	2570 °C
Boiling point	2850 °C (lit.)
Density	3.3 g/mL at 25 °C (lit.)
Bulk density	800-1200kg/m3
Refractive index	1.83
Fp	2850°C
Storage temp.	No restrictions.
Solubility	1.65g/l Risk of violent reaction.
Form	Powder
Color	White to yellow-very slightly beige
Specific Gravity	3.3
PH	12.6 (H2O, 20℃)(saturated solution)
Odor	wh. or gray cryst. or powd., odorless
Water Solubility	REACTS
Sensitive	Air & Moisture Sensitive
Crystal Structure	Cubic
Crystal system	Cube
Merck	14,1686
Space group	Fm3m
Lattice constant	a/nmb/ nmc/ nmα/ oβ/ oγ/ oV/ nm30.47760.47760.47769090900.1089
Dielectric constant	2.2（Ambient）
Exposure limits	ACGIH: TWA 2 mg/m3OSHA: TWA 5 mg/m3NIOSH: IDLH 25 mg/m3; TWA 2 mg/m3
Stability	Stability Stable, but absorbs carbon dioxide from the air. Incompatible with water, moisture, fluorine, strong acids.
InChIKey	ODINCKMPIJJUCX-UHFFFAOYSA-N
CAS DataBase Reference	1305-78-8(CAS DataBase Reference)
NIST Chemistry Reference	Calcium monoxide(1305-78-8)
EPA Substance Registry System	Calcium oxide (1305-78-8

Safety Information

Property	Value
Hazard Symbols	C, Xi
Risk Codes	34-41-37/38
Safety Statements	26-36/37/39-45-25-39
UN Number	UN 1910
Occupational Exposure Level	B
Occupational Exposure Limit	TWA: 2 mg/m³
WGK (Germany)	1
RTECS Number	EW3100000
Flammability (F)	10-21-34
TSCA Status	TSCA listed
Hazard Class	8
Packing Group	III
HS Code	28259019
Storage Class	13 – Non-combustible solids
Hazard Categories	Serious eye damage, Category 1; Skin irritation, Category 2; Specific target organ toxicity (single exposure), Category 3
Toxic Substance Data	1305-78-8 (Hazardous Substances Data)
IDLH (Immediately Dangerous to Life or Health)	25 mg/m³

Product Usage

Calcium oxide, commonly known as quicklime, is a vital industrial chemical with diverse applications rooted in its high reactivity and alkalinity. Its primary use is in the steel industry, where it acts as a flux to remove impurities like phosphorus and sulfur during smelting. In environmental protection, it is essential for flue gas desulfurization and wastewater treatment, effectively neutralizing acidic effluents and precipitating heavy metals. Furthermore, it serves as a critical building material for manufacturing calcium silicate board and mortar. In the chemical sector, it is a key reagent for producing calcium carbide and a high-efficiency desiccant for removing moisture from gases and organic solvents.

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Calcium Oxide

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