PET polymer is highly sensitive to heat and moisture during processing. Every new processing cycle brings down the molecular weight or intrinsic viscosity of PET. One of the cost effective and easy way of improving the viscosity and mechanical property of PET is by chain extension reaction during melt processing. Nexapol has developed an highly effective chain extender product to use in recycled PET processing. A very small dosage (1-2%) of the masterbatch helps to increase the melt strength of the polymer which enables easy processing, uniformity and better mechanical properties.