Filler Masterbatch Explained

Filler masterbatch is a compounded material designed to introduce mineral filler into a plastic formulation. A typical calcium carbonate filler masterbatch includes:

• Calcium carbonate
• PP or PE carrier resin
• Processing additives
• Surface-treatment or dispersion components

The precise formulation depends on the target application.

Why Manufacturers Use It

Filler masterbatch can make calcium carbonate easier to handle and meter during production. When properly formulated, it may support:

• Consistent mineral dispersion
• Controlled dosing
• Increased stiffness
• Modified product density
• Improved dimensional stability
• More efficient material formulations
• Reduced use of virgin polymer

Common Applications

Filler masterbatch is used in:

• PP woven bags
• Blown film
• Shopping and packaging bags
• Injection moulding
• Extruded sheets
• Pipes
• Household plastic products

Choosing the Right Masterbatch

Manufacturers should not select a filler masterbatch based only on calcium carbonate percentage or price. Important considerations include:

• Carrier resin
• Mineral particle size
• Calcium carbonate quality
• Dispersion
• Melt flow
• Moisture
• Addition rate
• Final-product performance

Production testing is essential because the optimum addition rate varies by application, machinery and quality target.

CarboCore supplies selected masterbatch and compound solutions alongside industrial minerals and polymers, creating a more integrated sourcing platform for plastic manufacturers.