There are two main reasons why CaCO₃ is used in plastic: it acts as a functional filler or mineral modifier (e.g. to produce breathable films) or it is used to reduce the costs of the compound.
What is important when using CaCO₃ is its very good incorporation into the polymer matrix. Coated CaCO₃ types are the most suitable. At MASKA GLOBAL, we use uncoated CaCO3 types to control the quality of CaCO3 with the right amount of acid and assure the surface coating adjusts the surface tension of the mineral to that of the polymer, greatly facilitating its incorporation and dispersion.