Fillers and compounds are functional additives used in plastic manufacturing to modify physical properties, improve performance, and reduce material costs. Most filler masterbatches use calcium carbonate (CaCO₃) combined with a carrier resin to create pellets that mix evenly into polymers during production.

In simple terms, fillers help plastics do more while costing less — and compounds ensure the additives are clean, easy to dose, and compatible with base resins like polyethylene and polypropylene.