The production of plastic and polymers require several phases in which a precise temperature is required. The reaction vessels are connected with heat Transfer System not only for providing heat but also to cool the production process. The optimal practise is to have one single fluid in the heat Transfer System that has the ability and capability of handling the wide temperature range. ADDOTHERM® Heat Transfer Fluids have been use in PET plants across the globe for its ability to adapt to the harshest of the production temperature requirements.