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With the advancement in plastic technology, new polymers are synthesized for demanding Industrial and engineering applications. To achieve high quality and desired properties these plastics require an extremely precise processing temperature. If the temperature of molten plastic entering the mould is at a slightly lower or higher temperature, the produced part may turn out to be defective. If the temperature is lower, the plastic does not flow evenly into the mould or fill all the cavities. A higher temperature polymer flow results in uneven solidification and longer hold-time. Heat transfer in the hot runner nozzle is therefore essential, to precisely maintain the desired temperature. To keep the plastic at the right temperature, the nozzle is externally heated using heating coils. Only at the very end - at the nozzle tip no further heating aid is used and the heated nozzle itself must transfer the heat to the plastic. Consequently, the thermal conductivity of the material is crucial.