Molding parts refer to those in direct contact with plastics to form the shape of plastic parts,wherein those constituting the contour of the plastic partsare called cavities and those constituting the internal shape of the plastic partsare called cores.Since the cavity and core directly contact the plastics of high temperature and pressure and rub with the plastic parts when protruding,it is thus required that they are provided with sufficient in-tensity,rigidity,hardness,abrasion resistance,corrosion resistance as well as low enough surface roughness.

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