The plastic products do not have color from the beginning, and additives or pigments are needed in the production process to obtain the desired color. 
Masterbatch, a solid product (usually plastic, rubber, or elastomer) in which pigments or additives are optimally dispersed in a carrier material at high concentrations. The carrier material is compatible with the main plastic that will be mixed during the molding process so that the final plastic product obtains color or performance from the masterbatch.

Engineering plastics can be used as engineering materials and plastics that replace metal manufacturing machine parts. Engineering plastics have excellent comprehensive properties, high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. Engineering plastics can be used for a long time in harsher chemical and physical environments and can replace metals as engineering structural materials, but they are more expensive and less productive.