Noun masterbatch (plural masterbatches)
A solid product (normally of plastic, rubber, or elastomer) in which pigments or additives are optimally dispersed at high concentration in a carrier material. The carrier material is compatible with the main plastic in which it will be blended during molding, whereby the final plastic product obtains the color or properties from the masterbatch. From http://en.wiktionary.org/wiki/masterbatch
From Wikipedia, the free encyclopedia
Masterbatch is a solid or liquid additive for plastic used for coloring plastics (color masterbatch) or imparting other properties to plastics (additive masterbatch).