As transparent plastic, want to assure high transparency above all, next intensity, impact resistance, wearability, heat resistance, chemical resistance is close friends, water absorption rate wants small, can satisfy the requirement of transparency in use only so. For the material selection of transparent plastics, PC is an ideal choice, but its price is high and injection molding process is difficult. Therefore, PMMA is often used, while PPE is often used in packaging and containers because it needs to be stretched to get good mechanical performance.