Calcium carbonate is widely used in plastics, and it is no accident that the plastics industry attaches great importance to it. Compared with other non-metallic mineral powder materials, calcium carbonate has obvious advantages.
The price is cheap. Whether it is heavy calcium or light calcium, the price of various non-mineral powder materials is the lowest, that is to say, any non-mineral powder material is only trying to replace calcium carbonate as a plastic filler, rather than highlighting the powder. The characteristics of the bulk material itself are meaningless.
Good color, easy to color and can be made into light-colored plastic products. The downside is that the color of colored plastic products is not bright enough, which is acceptable in most cases.
Low hardness Its Mohs hardness is 3, which is far lower than the hardness of steel used in the manufacture of processing machinery and molds, so the filled plastic has less wear on the contacting equipment parts and molds.
Good stability and chemical stability. The thermal decomposition temperature of calcium carbonate is above 800°C, and thermal decomposition will not occur at all plastic processing temperatures (below 300°C).
Calcium carbonate is a strong base and weak salt, and its chemical stability is good except in acidic medium.
Easy to dry, no crystal water, the adsorbed moisture can be easily removed by heating. Non-toxic, non-irritating, tasteless, calcite, marble, and limestone are abundant in resources, and there is a lot of room for choice. Most of the resources are of good quality, especially the content of heavy metals is low, which meets the national sanitary requirements.