What Is Used In Plastic Molding To Add Color?

January 16, 2024 4:00 pm Published by Leave your thoughts

Different,Colored,Jelly,In,Plastic,Forms,(selective,Focus)Plastic molding is a widely used manufacturing process that involves injecting molten plastic into a mold to create various products and components. The versatility and affordability of plastic make it a popular choice for numerous industries. One key aspect of plastic molding is the ability to add color to the end product. So, what is used in plastic molding to add color? Let’s explore the different methods and materials used in this process.

Masterbatch Coloring

One common method of adding color to plastic molding is through the use of masterbatch coloring. Masterbatch is a concentrated mixture of pigments or dyes dispersed in a carrier resin. The carrier resin is typically the same type of plastic material that will be used for the final product.

During the plastic molding process, the desired amount of masterbatch is mixed with the base resin, creating a homogeneous mixture. This mixture is then melted and injected into the mold, resulting in a colored product. Masterbatch coloring offers several advantages, such as precise color control, ease of use, and cost-effectiveness.

Pigment Mixing

Another method commonly used to add color to plastic molding is pigment mixing. Pigments are finely ground particles of color that are mixed directly into the molten plastic material. They provide a wider range of color options compared to masterbatch coloring.

Before the plastic molding process begins, the pigments are thoroughly mixed with the base resin to create a uniform blend. This mixture is then heated and melted, after which it is injected into the mold to form the product. Pigment mixing requires careful control of the pigment-to-resin ratio to achieve the desired color intensity.

Liquid Colorants

Liquid colorants are another option for adding color to plastic molding. These colorants are typically translucent and are composed of dyes dissolved in a solvent. Liquid colorants offer advantages such as easy incorporation into the plastic, excellent color dispersion, and the ability to achieve a wide range of colors.

Just like with masterbatch and pigment mixing, liquid colorants are mixed with the base resin before the plastic molding process. The liquid colorant-resin mixture is melted and injected into the mold, resulting in a colored product. It’s worth noting that liquid colorants may have limitations when it comes to achieving certain colors or achieving color consistency across multiple batches.

Color Matching

In some cases, achieving specific colors for plastic molding requires color matching. Color matching involves creating custom shades or matching existing colors to meet specific requirements. This process requires the expertise of color technicians and involves precise measurements and adjustments.

Color matching is typically done using a spectrophotometer, a device that measures the spectral reflectance of colors. By comparing the measurements of the target color and the existing color, the technician can make adjustments to the pigments or dyes used in the plastic molding process. This ensures that the final product matches the desired color accurately.

Considerations and Limitations

While adding color to plastic molding offers numerous possibilities, it’s important to consider some limitations and factors that can impact the final result. The type and quality of the pigments or dyes used, the resin compatibility, and the processing conditions all play a role in achieving the desired color.

Additionally, certain factors such as the thickness of the product, the presence of additives or fillers, and the processing temperatures can affect color distribution and intensity. Understanding these considerations and working with experienced color technicians can help ensure optimal results in plastic molding coloration.


Plastic molding provides the flexibility to add color to the end product, enhancing its aesthetic appeal and functionality. Whether through masterbatch coloring, pigment mixing, liquid colorants, or color matching, there are various methods and materials available for achieving desired colors in plastic molding. Considering the specific requirements and limitations of each method is crucial to achieve optimal results that meet the desired color specifications.

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