Injection molding the matters needing attention when choosing raw materials

1. Plastic coefficient of linear expansion is generally larger than the metal, some water easily, so the size is larger, the injection mold design must be selected according to the plastic varieties of gap and tolerance.
2. The use of all kinds of plastic have a certain strength of the medium in contact with the scope and allowed, this is should consider when selecting.
3. Some plastics, such as PC, PS, they have the stress cracking phenomenon, when in the design and injection to reduce stress, when the design to avoid stress concentration, strictly control the processing technology and appropriate post-processing.
4. The thermal conductivity of the plastic is generally low, in the selection and design of cooling system must be fully consider this.
5. Some plastics have a tendency to creep and shrinkage or deformation, should fully pay attention to the selection and design.