Product Description of Calcium Carbonate (CAS# 471-34-1)
Calcium carbonate naturally occurs as limestone in various forms, including marble, chalk, and coral. It is one of the most widely used raw materials in the chemical industry, with extensive applications in the production of cement, mortars, plasters, refractories, and glass for building materials. It is also utilized to manufacture quicklime, hydrated lime, and various calcium compounds.
Calcium carbonate is available in two main types: powdered and precipitated. Precipitated calcium carbonate features finer particles with higher purity and uniform size, making it suitable for a wide range of commercial applications. Different grades of precipitated calcium carbonate are used in products such as textiles, paper, paints, plastics, adhesives, sealants, and cosmetics.
It exists in two crystalline forms: hexagonal calcite and orthorhombic aragonite. Calcite decomposes at 825°C, while aragonite melts at 1,339°C (at 102.5 atm). Their densities are 2.71 g/cm³ (calcite) and 2.83 g/cm³ (aragonite). Calcium carbonate is insoluble in water (15 mg/L at 25°C) but soluble in dilute mineral acids.
As a naturally occurring compound, calcium carbonate is widely found in organisms and throughout the earth’s crust. After quartz, it is the most abundant mineral, primarily in the form of calcite. Geologically, calcium carbonate occurs in several mineral forms, including calcite, aragonite, and the rare vaterite. The crystalline structure of calcium carbonate varies depending on formation conditions such as temperature and pressure.
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Calcium carbonate Chemical Properties
Melting point | 825 °C |
Boiling point | 800 °C |
density | 2.93 g/mL at 25 °C (lit.) |
refractive index | 1.6583 |
storage temp. | Store at +5°C to +30°C. |
solubility | 5 M HCl: 0.1 M at 20 °C, clear, colorless |
form | random crystals |
color | White-beige to slightly beige-gray |
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Specific Gravity | 2.93 |
PH | 9.91(1 mM solution);9.91(10 mM solution);9.91(100 mM solution); |
Odor | Odorless |
PH Range | 8 |
Water Solubility | Insoluble |
λmax | λ: 260 nm Amax: ≤0.09 |
| λ: 280 nm Amax: ≤0.06 |
Merck | 141657 |
BRN | 8008338 |
Solubility Product Constant (Ksp) | pKsp: 8.54 |
Exposure limits | NIOSH: TWA 10 mg/m3; TWA 5 mg/m3 |
Dielectric constant | 6.1（Ambient） |
Stability: | Stable. Incompatible with acids, fluorine, ammonium salts, alum. |
InChIKey | VTYYLEPIZMXCLO-UHFFFAOYSA-L |
CAS DataBase Reference | 471-34-1(CAS DataBase Reference) |
EPA Substance Registry System | Calcium carbonate (471-34-1) |
Safety Information
Hazard Codes | Xi |
Risk Statements | 37/38-41-36/38-36 |
Safety Statements | 26-36/37/39-37/39-37 |
OEB | B |
OEL | TWA: 10 mg/m3 (total) |
WGK Germany | - |
RTECS | FF9335000 |
TSCA | Yes |
HS Code | 28365000 |
Hazardous Substances Data | 471-34-1(Hazardous Substances Data) |
Toxicity | LD50 orally in Rabbit: 6450 mg/kg LD50 dermal Rat > 2000 mg/kg |
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