What Grade of Calcium Carbonate Is Best for Paper Mills?

For paper applications, calcium carbonate should have:

  • High brightness (≥94%)

  • Low abrasion

  • Controlled particle size distribution

  • Low heavy metal content

  • Good dispersion performance

Surface-treated calcium carbonate is often recommended to improve retention and compatibility with paper chemicals.

Is calcium carbonate used as a filler or coating in paper?

Calcium carbonate is used both as a filler and a coating pigment. GCC is common for fillers, while PCC and fine GCC are widely used in paper coating.

What is the difference between GCC and PCC in paper?

GCC is mechanically ground and more cost-effective, while PCC is chemically produced with controlled particle size and higher brightness.

Does calcium carbonate affect paper strength?

High filler loading can reduce tensile strength, but optimized particle size and surface treatment can maintain good strength while improving optical properties.

Is calcium carbonate safe and environmentally friendly?

Yes. Calcium carbonate is non-toxic, recyclable, and environmentally friendly, making it suitable for sustainable paper production.