In general, calcium carbonate is the most important mineral in the plastics industry. The most outstanding proporties of calcium carbonate in the plastics industry are the following:
- Its high purity, which prevents any adverse catalytic effect in the ageing of the polymers.
- Its high degree of whiteness.
- Its low refraction index, which allows pastel shades and whites.
- Its low level of abrassiveness, which improves the life span of machines and equipment.
- Its good dispersability, particularly in the coated mechanical grades.
- Its low cost.
Calcium carbonate is widely used in oilcloths and plastics, particularly in plastified, rigid and polyolefin PVC. The surface treatment of the calcium carbonate provides the advantages of low plasticiser absorption and improved dispersion.
Calcium carbonate is a product with high whiteness, low oil absorption and good dispersion characteristics, which make it into an excellent general mineral load. It is used in the manufacturing of plastics, oilcloths, coatings and sealants, where a uniform product without any large particles is very important. And furthermore, its use in unsaturated polyester compounds (SMC, VMC, TMC) gives the finished parts excellent physical and surface properties. In short, the most important applications of calcium carbonate in this industrial sector are included in the manufacturing of: plasticised PVC, PVC plastisols, rigid PVC, polypropylene, polyethylene and unsaturated polyester resins.