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Pigments used for coloring plastics can be classified into three main categories: organic, inorganic, and synthetic. Organic pigments are derived from animal or plant sources, inorganic pigments come from minerals such as rocks and stones, and synthetic pigments are manufactured or refined, primarily for industrial applications.

How to Select the Best Pigment for Plastics

When choosing a pigment to color plastics, it’s essential to consider several key factors to ensure optimal performance and compatibility with the material.

Color Strength (Tinctorial Strength)
The pigment's ability to impart color to the plastic significantly affects the material's appearance and helps preserve the resin's properties.

Thermal Stability
The pigment must withstand the temperatures involved in the processing of plastics without undergoing changes. Beyond chemical compatibility, it is critical to ensure that the pigment remains stable and unaltered throughout the coloring process.

Compatibility with Polymers
At high temperatures and under significant mechanical energy inputs, such as during extrusion, chemical incompatibilities between the pigment and the polymer may occur. Therefore, it’s important to verify that the chosen pigment is fully compatible with the polymer system.

Particle Size and Molecular Weight
The size of the pigment particles can influence how the polymer behaves when colored. For instance, opaque pigments tend to have minimal impact on materials with higher molecular weights.

Recommendation pigments for masterbatch: