At present, the domestic fillers used in PVC plastic products mainly include calcium carbonate, talc, and kaolin, among which calcium carbonate is an important filler, and is also a commonly used filler in the formulation of PVC-U products such as pipes, sheets, profiles and window profiles.

Calcium carbonate is one of the factors that increase the volume of PVC-U products, reduce costs, improve stability, hardness and stiffness, improve the processing properties of PVC-U products, improve their heat resistance, and improve the astigmatism, scratch resistance and strength of products. kind of filler.