Masterbatches are used to improve the mechanical and aesthetic look and feel of plastic. Plastic by default is not available in the fancy colours your see in the final product, it has to be coloured and modified with additives. Usually, a plastic goods manufacturer approaches a masterbatch supplier for the modifiers and additives. Manufacturers prefer buying modifiers from a masterbatch supplier because compounded materials cost more than products manufactured using masterbatches.
Masterbatches have multiple uses; here are a couple of them.
To Make Products Visually Appealing
Unless artificially added, polymers are mostly colourless. It is necessary to add pigments to the batch to add colour to the final product. Depending on what you expect from the final product, masterbatches can either carry a translucent pigment or bright colour as necessary. Every masterbatch supplier may have a few variations in their product line up. Some choose to offer their products purely for the purpose of pigmentation.
To Enhance Physical Properties
Once, again, polymers used in making plastic products do not have what it takes to withstand relentless assault from the elements. UV wreaks havoc on the intrinsic properties of polymer and deteriorates its resistance to physical stress. UV stabilizers are added to the product in order to prevent the final product from being damaged by harmful UV rays.