Product Description
Calcium Carbonate (CaCO₃) is a widely available inorganic compound naturally found in limestone, marble, chalk, and coral. It is an important industrial raw material with applications across construction, chemical manufacturing, paper, plastics, coatings, and other industries.
Calcium carbonate is widely used in the production of cement, plaster, glass, quicklime, hydrated lime, and various calcium-based compounds.
It is commercially available in both ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) forms. PCC generally offers higher purity, finer particle size, and more uniform particle distribution, making it suitable for applications in paper, paints, coatings, plastics, textiles, rubber, and cosmetics.
Product Parameters
| 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 |
| 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 | 14,1657 |
| 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 |
Calcium Carbonate (CaCO₃) occurs mainly in two common crystal forms: calcite, which has a hexagonal crystal structure, and aragonite, which has an orthorhombic structure. Vaterite is a much rarer polymorph.
Calcium carbonate is insoluble in water but readily soluble in dilute acids, producing the corresponding calcium salts and releasing carbon dioxide.
Calcite is the most abundant form and is widely found in natural mineral deposits. The crystal form of calcium carbonate depends on temperature, pressure, and formation conditions.
Upon heating, calcium carbonate decomposes to form calcium oxide (CaO) and carbon dioxide (CO₂). The commonly cited decomposition temperature for calcite is around 825°C, while aragonite undergoes structural transformation before decomposition.
