Acrylonitrile styrene (AS), which “Acrylonitrile styrene copolymer” is official Japanese name, has the same transparency as polystyrene (PS), and has a higher hardness, impact resistance, chemical resistance, and heat resistance than polystyrene (PS). It is a material with excellent properties such as excellent tensile strength, impact strength, and heat-resistant temperature, and it is hard to be scratched due to large surface hardness. Furthermore, it has good resistance to dilute acids, dilute alkalis, detergents and oils. Acrylonitrile styrene (AS) takes advantage of these characteristics and is used in tableware used in homes and cap parts for tablets.