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Calcium Carbonate

Calcium carbonate is an essential and versatile mineral which finds its way into our daily life.

Worldwide for calcium carbonates
For high-end solutions: breathable films, latex gloves, moisture-sensitive sealants & adhesives
Over 250 grades available worldwide


Calcium carbonate is one of the most abundant minerals on Earth and accounts for about 4% of the Earth’s crust. It can be found in nature in three principal rock types: chalk, limestone and marble.  

Ground Calcium Carbonate (GCC) - created by nature over millions of years

Most calcium carbonate deposits are made up of the skeletal remains of marine organisms that have sedimented to the bottom of a shallow sea.  Under the right conditions, these sediments build up over time to form thick layers. Geological movements and metamorphic processes lead to a differentiation in their crystallization, giving either:

  • chalk, a soft rock often associated with siliceous impurities; 
  • limestone, which is harder, whiter and purer than chalk; 
  • marble, which is the hardest and purest form of calcium carbonate.

Precipitated Calcium Carbonate (PCC) - created by man in a matter of hours

Calcium carbonate can also be produced synthetically in the form of Precipitated Calcium Carbonate (PCC). PCC is created through the conversion of limestone into CaO and CO2 and the subsequent reaction of both purified components in a chemical reactor. The final product has the same chemical composition as GCC, but is higher purity and has different properties in terms of particle size distribution and particle shape. 

The high whiteness and opacity of carbonates lend themselves to a great many applications, from building materials to paper and paint, to construction and foodstuffs.

Our site in Sylacauga (USA).


Calcium carbonate has the chemical formula CaCO3.


  • High brightness
  • Blocky particle shape
  • Odorless
  • Thermal conductivity
  • Insoluble in water
  • Relatively soft (3 on Mohs scale)



Imerys owns calcium carbonate assets in over 21 countries, including 3 dedicated Technology Centers, 48 production sites and 15 deposits located in China, Europe, North and South America and South East Asia. 

Imerys combines high quality feed materials, state of the art processing techniques and in-depth market knowledge to generate a broad portfolio of ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) products to serve construction, paper, paint, plastics, rubber, adhesives, food and pharmaceuticals, agriculture and industry.

Blocks of Calcium Aluminate
Calcium Aluminate in crushed form
Calcium carbonate rock
Calcium carbonate in powder form


The high whiteness and opacity of carbonates lend themselves to a great many applications.

In paints and coatings, Imerys calcium carbonates are cost-effective multifunctional fillers that improve whiteness, opacity and matting. They make ideal replacements for titanium dioxide. 

In plastics, Imerys engineered calcium carbonates improve the quality of breathable films for diapers, hygiene, medical and roofing applications. They are excellent reinforcement agents maximizing mechanical properties in PVC building profiles and flooring.

In paper production, Imerys calcium carbonates are cost-effective filler substitutes for wood fiber where they improve brightness and paper optics. As paper and paperboard coatings, they enhance whiteness and opacity as well as the printability of the finished paper. 

In animal feed, food and beverage and pharmaceuticals, Imerys calcium carbonates provide a valuable source of the bone-building mineral, calcium. 

In adhesives and sealants, finely ground calcium carbonates can be used at high loadings where they improve rheological properties, improve whiteness and opacity and generate cost savings. 

In industry, Imerys limes are valued raw materials and process enablers for the steel industry, sugar industry, water treatment and the building industry. In oil and gas production, ground calcium carbonates reduce filtration loss in drilling fluid formulations.

Calcium carbonate is an abundant and very versatile mineral, making it a key mineral for the future. Placing innovation at our core, we strive to meet and anticipate the future needs of our customers in present and new economy environments.

Calcium carbonates improve whiteness, opacity and matting in paints.

Health & Personal Care

Natural ingredients for high performance products

Plastics & rubber


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