In general, normally available pet based masterbatches does not give proper dispersion during the manufacturing of bigger size pet bottles. These masterbatches adversely affect the i.V of the resin and hence there is variation in thickness of the bottles. Separation of layers is also observed which decreases the strength of the bottles. To avoid these drawbacks, m.G.Polyblends has successfully developed a colour masterbatch which consists of pet compatible low molecular weight polymer as a carrier resin along with some specialty dispersing agent, processing aid and stabilizer. This masterbatch has no effect on the i.V value of the polymer and hence there is no variation in the thickness as well strength of the bottles.