The most common use of masterbatch in injection molding is for coloring plastic products. Masterbatch contains a high concentration of pigment or dye, which is dispersed uniformly throughout the plastic when it is melted and injected into the mold. This allows for precise color control and consistency in the final product.

When using masterbatch in injection molding, it's essential to choose the right type and concentration of masterbatch to achieve the desired color or property enhancement while maintaining the overall material properties. The masterbatch is typically added to the plastic resin in the hopper of the injection molding machine, where it is mixed and melted with the resin before being injected into the mold cavity to form the final product.