Strictly speaking, it cannot be said that light calcium is "light" and heavy calcium is "heavy". For example, adding 20% heavy calcium carbonate to woven flat yarn does not affect the total length of each ton of material, because in the process of uniaxial stretching (stretching multiple is 6 times), 80% polypropylene is stretched to the same length as 100% polypropylene, but the distance between polypropylene macromolecules is widened, and heavy calcium particles are distributed in the gaps between polypropylene macromolecules, thus greatly reducing the influence on the density of plastic materials. Therefore, it is not necessary to consider whether to use light calcium or heavy calcium from the point of view of density in uniaxial tensile plastic products. Light calcium was used in rubber materials and products earlier than specific gravity calcium, and then transplanted into plastic materials. Heavy calcium was only widely used in the 1980s. In early years, light calcium was used in artificial leather, pipes, profiles and other products. In the process of replacing light calcium with relatively low-priced heavy calcium, it is found that the effect is not ideal, and it is uneconomical in terms of material properties, appearance and feel, and unit price of area and length. At present, the processing technology of heavy calcium carbonate is very mature, and the advantages of deep processing are obvious. There is a trend that heavy calcium replaces light calcium. Heavy calcium carbonate is widely used in plastic woven products, pipes, injection molded products or hollow products.
There are still some differences in the requirements of using heavy calcium and light calcium in plastic industry, because of the different physical and chemical characteristics, we choose raw materials according to the requirements of products.