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Grade selection depends on the process first, then on the property you are trading away. These are the four processes we quote most often, with the grade and addition rate that normally fits.
Typical grade: CaCO3 filler masterbatch, 80% CaCO3, 1250 mesh, LDPE/LLDPE carrier.
Addition rate: 10–30% for carrier bags, T-shirt bags and agricultural film.
Trade-off: tear and tensile strength fall as loading rises. Above 30% the drop becomes difficult to compensate on a standard line.
Buyers: bag converters, film extruders, agricultural film producers.
Typical grade: black masterbatch, 40% N330, PE carrier.
Addition rate: 2–2.5% in the finished compound.
Function: colour plus UV screening for outdoor service.
Buyers: pipe extruders, conduit manufacturers, infrastructure contractors.
Typical grade: CaCO3 filler in PP carrier, or white masterbatch at 60% TiO2.
Addition rate: 20–40% filler for cost reduction; 2–5% white for colour.
Trade-off: filler raises stiffness and heat deflection temperature but lowers impact strength.
Buyers: household goods moulders, crate and pallet producers, appliance part makers.
Typical grade: white masterbatch, 60% rutile TiO2, PE carrier.
Addition rate: 4–10% for thin film, 2–5% for thick film.
Function: opacity and whiteness for label, lamination and food packaging film.
Buyers: flexible packaging converters, label stock producers, thermoformers.
Three questions decide it. Answer them and the grade follows.
PE and PP carriers are not interchangeable. A PE-carrier grade will disperse poorly in PP and can cause surface defects.
Filler trades strength for cost. White trades transparency for opacity. Black trades nothing except a colour requirement, and adds UV screening.
Thin walls need a higher pigment loading to reach full hiding. Thick walls reach the same opacity at a lower rate.
Resin, process, wall thickness and target addition rate is enough for us to recommend a grade and quote it.
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