Difference between PCC precipitated calcium carbonate and GCC ground calcium carbonatePosted: 2016-07-22

  • Calcium carbonate in the form of chalk, whiting, and limestone is perhaps the most widely available and utilised mineral in the worldadditives today. Processed to be available in a wide range of particle sizes, the products function as low cost fillers added to extend and cheapen the widest range of polymeric systems.

    In comparison to this, synthetic PCCs offer a range of technical effects beyond the capability of GCC fillers and other more expensive and sophisticated additives. Ultrafine coated precipitated calcium carbonates (CPCC) are characterised by five important attributes:
    Primary particle size (20-70 nanometres)
    Regularity of shape
    Narrowness of particle size distribution
    Surface coating of calcium stearate
    High purity
    The combination of these properties clearly differentiates CPCC from GCC fillers and is also a factor in explaining the performance effects that are observed during the use of the precipitated products in rigid PVC.
    Figure1 below compares the granulometry between ground and precipitated calcium carbonate:
     
    granulometry of 1 micron Ground Calcium Carbonate granulometry of 70 nanometres Precipitated Calcium Carbonate
    1 micron Ground Calcium Carbonate
    pcc p2 1image1.gif
     
    70 nanometresPrecipitated Calcium Carbonate
     
    pcc p2 1image2.gif
     
    Figure 1: Granulometry between ground and precipitated calcium carbonate
     
    The manufacture of synthetic calcium carbonate by the reaction of gaseous carbon dioxide with a colloidal suspension of calcium hydroxide is sufficiently versatile to allow a number of different morphologies to be developed. Distinctive and reliable reaction control criteria exist for the manufacture of PCC where morphology and crystalline size can be varied at will.
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