Plastic is the general common term for a wide range of synthetic or semi synthetic organic solid materials suitable for the manufacture of industrial products. Plastics are typically polymers of high molecular weight, and may contain other substances to improve performance and reduce costs. PET Preform are relatively small partially molded PET products sold for the purpose of being reheated and blow molded into PET bottles. Over nine million tons of PET is used in containers every year, and the bulk of that PET is sold at one stage or another as a PET preform. A PET preform will have its neck pre molded to its final shape, but instead of the rest of the preform being the large thin walled vessel it will be when production is finally complete, it is instead a short, relatively thick walled tube.