Masterbatch

Also called: Colour masterbatch, additive masterbatch, black masterbatch, filler masterbatch

Masterbatch is a concentrated mix of pigment or additive in a carrier polymer, added in small amounts to colour or modify plastics during processing.

Masterbatch is a concentrate of pigments or additives dispersed in a carrier plastic and supplied as granules. Processors add it in small proportions to natural or recycled material during moulding or extrusion. Common types include colour masterbatch, black and white masterbatch, UV stabiliser, anti-static and slip masterbatch, and filler masterbatch based on calcium carbonate.

Why it matters when buying recycled plastic

• Recycled granules often have variable colour. A black or dark masterbatch can give a consistent finish when colour cannot be controlled at source.
• The carrier polymer should be compatible with your base resin; for example, a PE carrier for PE products.
• Natural or light-coloured recycled grades are more expensive because they can be coloured to any shade.
• Filler masterbatch increases density and ash content, so account for it when testing incoming recycled material.

Masterbatch vs compound

A masterbatch is a concentrate let down by the processor, while a compound is a ready-to-use material with all additives already in it. Mention any masterbatch you plan to use in your RFQ so suppliers can offer a suitable base grade.