Calcium Carbonate Filler Masterbatch: Cutting PP Cost Without Cutting Quality
A well-formulated CaCO3 masterbatch is one of the simplest ways to bring down raw material cost per kg - if the particle size and coating are right.
What Is Calcium Carbonate Filler Masterbatch?
Calcium carbonate (CaCO3) filler masterbatch is a carrier-resin concentrate loaded with finely ground, surface-coated calcium carbonate. It is let down into virgin or recycled PP at the extruder or moulding machine to replace a portion of the base resin, reducing material cost while adding stiffness and dimensional stability to the finished part.
Why Manufacturers Use It
PP resin is priced by the kilogram, and calcium carbonate is significantly cheaper. Replacing 10-40% of the resin with a good filler masterbatch reduces shrinkage, improves stiffness, and can even shorten cycle time in some moulding applications - all while keeping the part visually and mechanically acceptable for its end use.
What Affects Performance
Not every CaCO3 masterbatch behaves the same way. Three variables matter most:
- Particle size - finer grades disperse better and cause less impact-strength loss
- Surface coating (stearic acid or silane) - improves bonding with the PP matrix and processability
- Loading percentage - too high a loading makes parts brittle and reduces gloss
Where It Is Used
CaCO3-filled PP is common in injection-moulded houseware, crates, pails, automotive interior trim, pipe fittings and woven sack applications where cost efficiency matters more than optical clarity.
Get grade recommendations based on your target loading, resin type and part requirement from Siya Polymer's technical team.
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