White masterbatch is a type of additive used in the blow molding process to impart whiteness and opacity to plastic products. White masterbatch is often used in the production of opaque plastic containers, such as milk jugs, detergent bottles, and cosmetic packaging, where it provides a consistent white color and opacity to the products.

Blow-molded packaging for cosmetics, lotions, and toiletries frequently incorporates white masterbatch to convey a clean and elegant image. In the pharmaceutical industry, white masterbatch can be used for the production of pill bottles, medical vials, and other packaging to maintain product integrity and sterility.