Filler is not only “cheaper”
Raising carbonate without grade, surface and matrix-filler interface usually returns high torque, impact loss and scrap. Cost gains only hold when processability follows.
Quick diagnosis
Separate formulation symptoms (modulus, elongation, impact) from process symptoms (torque, fusion, surface). In PVC and compounds, coupling and lubrication belong in the same diagnosis.
Plectus next step
Compound, masterbatch, PVC and coatings landings detail the application. Request a Calcium Carbonate sample and, if mechanics drop with filler, evaluate a coupling agent in the same package.