Black masterbatches are high concentrations of carbon black, typically 15 - 50% dispersed in thermoplastic resins which act as a carrier or binder. Other black pigments, such as nigrosine dye and bone black can also be used depending on the application and resin system. Masterbatches and concentrates allow plastic processors to utilize carbon black and other dry powders in a pre-dispersed pellet form, allowing easy incorporation in extrusion and molding processes. These masterbatches are then incorporated into various polymers to impart properties such as color, UV resistance, and electrical or thermal conductivity.