Plastic material selection and formulation. This product is made of styrene butadiene acrylonitrile (ABS) material. ABS with moisture absorption, in order to ensure the quality of the product, forming the front, must be fully dry raw materials. Drying method can be used in the hopper dryer (temperature 70 ~ 85, 2 h). After drying the moisture content should be no more than 0.1%.