PET preform molds are typically made of high-strength mold steel or high-performance alloy materials. Based on material properties, they can be classified as follows:
High-Hardness Cold Work Mold Steel
Commonly used in molds requiring wear resistance and high precision, such as H13 and 2316 steel. Its characteristics include high hardness and good wear resistance, maintaining stable cavity dimensions during long-term production.
Corrosion-Resistant Stainless Steel
Such as S136 and 420 stainless steel, suitable for production environments with high requirements for preform surface finish and susceptibility to acid and alkali corrosion. Corrosion-resistant steel ensures a smooth mold surface and reduces surface defects in the preform.
Aluminum Alloy or Copper Alloy Auxiliary Materials
Used in non-load-bearing components or hot runner systems of molds, possessing good thermal conductivity and machinability, improving mold cooling efficiency and production speed.
The selection of different materials requires a comprehensive evaluation based on production scale, product specifications, production environment, and raw material type.
