ABS, polystyrene and polypropylene are the most commonly-used plastic materials in household appliances. PP can be used in barrel rolls and also fabricated into internal barrel of dishwasher. Bosch-Siemens Group has launched a PP internal-barrel dishwasher, which can endure an 80°C cleaning agent for dishwasher with stable performance and color. It is predicted that PP will be widely used in other internal devices of dishwashers in the future, such as steel hinges and steel brackets with PVC coating in addition to the internal barrel. Lining materials of refrigerator doors are turning from HIPS (high impact polystyrene) to ABS, which can reduce wall thickness or cost without affecting the strength of components.