Calcium Carbonate as a Functional Filler

Calcium carbonate is widely incorporated into plastic formulations as a functional mineral filler. Its performance depends on particle size, surface treatment, dispersion, loading level and compatibility with the selected resin.

Potential Benefits

When the correct grade is used, calcium carbonate may help:

• Increase stiffness and rigidity
• Improve dimensional stability
• Modify density
• Enhance surface appearance
• Support consistent processing
• Reduce dependence on virgin resin
• Improve formulation economics

Actual results vary according to the application and must be confirmed through production trials.

Common Plastic Applications

Calcium carbonate can be used in:

• PP woven bags and fabrics
• PE films
• Filler masterbatch
• PVC pipes and profiles
• Injection-moulded products
• Thermoformed sheets
• Extruded products
• Selected nonwoven applications

Coated or Uncoated?

Coated calcium carbonate is frequently preferred in polymer formulations because its treated surface can improve compatibility and dispersion. Nevertheless, the coating percentage and treatment quality must be controlled.

Choosing the Correct Grade

The manufacturer should consider:

• Polymer type
• Melt flow requirements
• Production equipment
• Desired loading percentage
• Mechanical-property targets
• Film or product thickness
• Surface-finish requirements

CarboCore supports plastic manufacturers with application-focused calcium carbonate grades, clear specifications, laboratory testing and flexible export packaging.