Calcium Carbonate

Calcium Carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. Although all three forms are identical in chemical terms, they differ in many other respects, including purity, whiteness, thickness and homogeneity. Calcium Carbonate is one of the most useful and versatile materials known to man.

Calcium Carbonate is the most widely used mineral in the paper, plastics, paints and coatings industries both as a filler – and due to its special white color - as a coating pigment. In the paper industry it is valued worldwide for its high brightness and light scattering characteristics, and is used as an inexpensive filler to make bright opaque paper. Filler is used at the wet-end of paper making machines, and calcium Carbonate filler allows for the paper to be bright and smooth. As an extender, it can represent as much as 30% by weight in paints. Calcium Carbonate also is used widely as a filler in adhesives, and sealants.

Types & specifications:

Calcium Carbonate No.1 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 0/39
Al 0/05
Si 0/11
K 0/01
Ca 55/86
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 99/57
yellow Index   ASTM E313/D65/10°/Spex YI -1/01
White Index   WI 96/56
yellow Index   DIN 6174/D65/10°/Spex L* 97/8
White Index a* -0/1
b* -0/49
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 8/14
Calcium Carbonate No.2 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 1/01
Al 0/06
Si 0/1
K 0/08
Ca 55/06
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 99/03
yellow Index   ASTM E313/D65/10°/Spex YI -0/62
White Index   WI 98/76
yellow Index   DIN 6174/D65/10°/Spex L* 99
White Index a* -0/06
b* -0/3
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 8/85
Calcium Carbonate No.3 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 0/16
Al 0/01
Si 0/1
K 0/01
Ca 55/83
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 99/59
yellow Index   ASTM E313/D65/10°/Spex YI 1/13
White Index   WI 88/92
yellow Index   DIN 6174/D65/10°/Spex L* 96/69
White Index a* -0/01
b* 0/6
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 9/3
Calcium Carbonate No.4 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 0/41
Al 0/08
Si 0/25
K 0/01
Ca 55/45
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 98/92
yellow Index   ASTM E313/D65/10°/Spex YI 0/38
White Index   WI 95/4
yellow Index   DIN 6174/D65/10°/Spex L* 98/46
White Index a* -0/07
b* 0/23
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 9/86
Calcium Carbonate No.5 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 0/82
Al 0/18
Si 0/42
K 0/1
Ca 53/83
CI 0/95
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 95/87
yellow Index   ASTM E313/D65/10°/Spex YI 3/08
White Index   WI 79/85
yellow Index   DIN 6174/D65/10°/Spex L* 95/5
White Index a* 0/13
b* 1/98
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 8/35
Calcium Carbonate No.6 Specification
Typical Test UNIT TEST METHOD SPECIFICATION RESULT
XRF analysis %wt ASTM E1621-1 Mg 0/29
Al 0/08
Si 0/17
K 0/07
Ca 55/75
XRD&SRF %wt ASTM E1621-1 Calcite (CaCO3) 99/4
yellow Index   ASTM E313/D65/10°/Spex YI 4/21
White Index   WI 74/67
yellow Index   DIN 6174/D65/10°/Spex L* 93/67
White Index a* 0/09
b* 2/14
Acidity or Alkanity of aqueous extract   ISO 787-4 pH 9/8

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