Used for mass production with high dimensional accuracy. In die-casting, a shape-casting process, molten aluminium or aluminium alloy is forced into a steel mould at pressures of several hundred to several thousand bar. After solidification, the finished casting is ejected and the mould is filled again. Benefits compared with other casting processes are the high rate of production (the manufacture of small castings only takes a few seconds), high surface finish (which in many cases eliminates the need for buffing or finishing) as well as high dimensional accuracy even with complex shapes and thin walls. A disadvantage compared with permanent mould casting is the lower strength of the cast part. Die-casting is very economical for large-scale production of finished parts from extremely small up to medium size. Above all it is increasingly being used in the car industry (for example for chassis and body parts).