The CaCO3 in the filler is found in sedimentary rocks (chalk, limestone), marbles and minerals (dolomite). Especially in Vietnam, calcium carbonate is made of natural mineral calcite with high pure over 99 %, high whiteness > 96 %, treatment surface by additive and use perfect technology, which helps to improve some properties such as: whiteness, hardness, strength.
Plastic filler can have a large percentage of calcium carbonate in its composition. Calcium carbonate powder accounts for 97% of composition and will bring for white/opaque products more whiteness. With smaller percent, calcium carbonate powder can be used for color products. In addition, it brings for final plastic products a brighter and glossy surface.