Calcium Carbonate (CaCO₃)
It is a mineral filler used in polypropylene (PP) to improve properties such as hardness, stiffness, dimensional stability, and processability. When incorporated, CaCO₃ can improve dispersion, printing ink anchoring, opacity, and molding efficiency. It also reduces costs by being a substitute for more expensive materials and can increase thermal conductivity, accelerating heating and cooling during plastic processing.
Characteristics
Mechanical and dimensional improvement
CaCO₃ can increase the hardness and stiffness of PP, as well as improve its dimensional stability.
Surface properties and appearance
Contributes to a smoother surface and improves the gloss and opacity of PP products.
Processability and efficiency
It facilitates the processing of PP, increasing productivity and operational efficiency, especially in applications such as thermoforming.
Cost Reduction
It acts as an economical filler that replaces part of the virgin polymer, thereby reducing production costs.
Printing ink anchoring
It improves the ability of PP to receive and retain ink, which is useful for films and other printed products.
Additional benefits
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There are different types of calcium carbonate, including nano-CaCO₃ with smaller particles, which can offer superior stiffness properties.
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The improved thermal conductivity of CaCO₃ allows the plastic to heat and cool faster, reducing energy consumption.
Common Uses
It is used in the manufacture of injection-molded and extruded products, and as a filler in PP masterbatches.
