Masterbatch vs. compound
A masterbatch is a pigment, filler or additive – UV stabiliser, antistatic, flame retardant, slip – dispersed at high concentration in a carrier polymer and let down into the base resin, typically at 1–5 %. A compound is a ready-to-use product containing the final formulation: for example 30 % glass-fibre-reinforced PA6, talc-filled PP or HFFR cable compound, processed directly. Masterbatch gives flexibility and low inventory; a compound guarantees consistent quality and technical properties.
Related terms
Melt flow index (MFI / MFR)
The mass of molten polymer that flows through a die in 10 minutes at a set temperature and load – 230 °C/2.16 kg for PP, 190 °C/2.16 kg or 5 kg for PE – expressed in g/10 min (ISO 1133, ASTM D1238). A low MFI means high molecular weight and strength, a high MFI easy flow: pipe and blow-moulding grades are about 0.1–1, film 1–4, injection 10–60, and fibre and meltblown 25–1,500 g/10 min. When comparing offers, always check the test conditions.
Recycled content (PCR / PIR)
PCR (post-consumer recycled) material comes from packaging and products that have reached consumers and become waste; PIR (post-industrial recycled) comes from production scrap and trimmings. Rules such as the EU Packaging and Packaging Waste Regulation (PPWR) and brand pledges are setting minimum PCR shares in packaging. Recycled-content claims should be verified with certification such as GRS, RecyClass, EuCertPlast or ISCC PLUS (mass balance); food-contact rPET additionally needs an approved super-clean process.