I. Drying Process: If the material is sealed before processing, then drying is not necessary. However, if the storage container has been opened and the humidity is not too high, it is recommended to dry the particles in hot air at 85°C before processing. If the air humidity at the time is greater than 0.2%, a vacuum drying process at 105°C for 12 hours is also required.

II. Melting Temperature: Generally, the melting temperature is between 260°C and 290°C. However, for products that have been added with glass additives, the melting temperature should be controlled within 275°C to 280°C. In any case, the melting temperature should be avoided from exceeding 300°C.

III. Mold Temperature: Recommended at 80°C. Mold temperature will affect the crystallinity, which in turn will influence the physical properties of the product. For thin-walled injection molded products, if the mold temperature used is below 40°C, the crystallinity of the product will change over time. Therefore, to maintain the geometric stability of injection molded products, it is necessary to anneal the final product.

IV. Injection Pressure: Typically ranging from 750 to 1250 bar, the injection pressure primarily depends on the material properties and the design of the product.

V. Injection Speed: It is recommended to use a high injection speed, although it should be slightly lower for reinforced materials.

VI. Runner and Gate: Due to the short solidification time of PA66 plastic, the location of the gate is extremely important. The diameter of the gate should preferably not be less than 0.5*t (where t is the thickness of the product). If a hot runner system is used, the gate size should be smaller than that used with a conventional runner because the hot runner can help prevent the material from solidifying prematurely. If a submarine gate is used, the minimum diameter of the gate should be 0.75mm.

VII. Chemical and Physical Properties of PA66 Plastic: PA66 plastic has a relatively high melting point among polyamide materials. It is a semi-crystalline to crystalline material. PA66 plastic maintains strong strength and stiffness even at higher temperatures. After molding, PA66 still exhibits hygroscopicity, which primarily depends on the composition of the material, wall thickness, and environmental conditions. During product design, it is essential to consider the impact of hygroscopicity on geometric stability. To further enhance the mechanical properties of PA66 plastic, various modifiers are often added. Glass is the most common additive, and sometimes synthetic rubbers such as EPDM and SBR are added to improve impact resistance. PA66 plastic has low viscosity, thus exhibiting good flowability (although not as good as PA6). This property allows for the processing of very thin components. Its viscosity is very sensitive to temperature changes. The shrinkage rate of PA66 plastic is between 1% and 2%, and the addition of glass fiber additives can reduce the shrinkage rate to 0.2% to 1%. There is a significant difference in shrinkage rates between the horizontal and vertical directions. PA66 plastic is resistant to many solvents, but has weaker resistance to acids and some other chlorinating agents.