Clear plastic injection molding parts usually made in GPPS, PC, PMMA(Acrylic), AS(SAN), PET, Tritan and so on. Due to the high light transmittance, clear plastics must have strict requirements on the surface quality of plastic products, without any markings, pores, and whitening. Defects such as haze, black spots, discoloration, poor gloss are not acceptable. Since most of the transparent plastics have high melting point and poor fluidity, it is often necessary to make suitable adjustments to the process parameters such as mold temperature, injection pressure, injection speed, etc. in order to ensure the surface quality of the product. Meanwhile, the surface of mold cores & cavities is required high mirror polishing to get shiny and clear products. High hardness of mold steel is necessary to avoid scratching during ejection