A filler masterbatch is a type of additive masterbatch used in plastics manufacturing to improve material properties, reduce costs, or enhance processing by adding high concentrations of filler materials into a polymer carrier. Instead of adding raw fillers directly during molding or extrusion, they are pre-dispersed in a masterbatch, which ensures even distribution and easier handling.
Key Points about Filler Masterbatch:
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Purpose:
- Reduce the overall cost of plastic products (fillers like calcium carbonate are cheaper than polymer).
- Improve mechanical properties (stiffness, hardness, thermal stability).
- Enhance processing efficiency and reduce shrinkage or warpage.
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Common Fillers:
- Calcium carbonate (CaCO₃) – most common, improves rigidity.
- Talc – enhances stiffness and heat resistance.
- Glass fibers – increase strength and durability.
- Kaolin, silica, or mica – improve surface finish, dimensional stability, or barrier properties.
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Advantages of Using Filler Masterbatch:
- Easier handling and dosing compared to loose fillers.
- Better dispersion in the polymer matrix.
- Consistent quality in the final product.
- Can be combined with other additives (color, stabilizers, lubricants).
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Applications:
- PVC profiles, pipes, and fittings.
- Polypropylene or polyethylene packaging films.
- Automotive parts.
- Household goods and construction materials.
In short, a filler masterbatch is a concentrated mixture of filler and polymer, designed to make the plastic more cost-effective and sometimes improve its physical properties while simplifying manufacturing.