Choosing the right materials for your injection molds is crucial for the success of your project. The materials affect the performance, durability, appearance, and cost of your injection molded parts. You should consider the properties of the material, such as strength, stiffness, toughness, heat resistance, chemical resistance, and colorability. You should also consider the compatibility of the material with the injection molding process, such as flowability, shrinkage, warpage, and cooling rate. Moreover, you should consider the availability and cost of the material, as well as the environmental impact of its production and disposal. Finally, you should consider the requirements and specifications of your product, such as functionality, aesthetics, safety, and compliance.