A master alloy is a base metal such as aluminium, copper or nickel combined with a relatively high percentage of one or two other elements. A master alloy is a semi-finished product. It is manufactured for use as a raw material by the metals industry. Master alloys are produced in various shapes. Examples are: ingot, waffle plate, rod in coils, etc. Master alloys are used worldwide. Invariably they are found in plants where metal is melted, alloyed with various elements and then cast into shapes. This can be aluminium, iron, steel or even a precious metal such as gold. There are various reasons for adding master alloys to a melt. One of the main applications is composition adjustment, i.e. changing the composition of the liquid metal to achieve the desired chemical specification. Another important application is structure control – influencing the micro-structure of a metal during the casting and solidification process in order to change its properties.