1. The selection of molding materials should take into account such factors as optical clarity, impact resistance, heat and chemical resistance, viscosity and melt flow rate.
2. The choice of additives, the choice of materials will determine which additives can be used, such as: anti-scratch, anti-fog, precision coating or heat reflective coating.
3. The specific use of the product; the use of different products determines the choice of molding materials. These factors are considered in the early stage of injection mold design, because these special materials may affect the gate and exhaust.

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