The plastic industry is the largest application area of heavy calcium carbonate. Calcium carbonate can play a skeleton role in plastic products, which has a great effect on the dimensional stability of plastic products. It can also improve the hardness, surface gloss, and smoothness of products. Since this type of calcium carbonate has a whiteness of more than 94, it can also replace some expensive white pigments. Due to its low price, high chemical purity, high inertness and good thermal stability, it is widely used in PVC, PE and PP as well as various unsaturated resins, among which PVC products are the earliest and largest application market for heavy calcium carbonate.