Cast AlNiCo Magnets using patterns and simple moulding techniques, Cast AlNICo Magnets can be cast to form a vast range of complex shapes and sizes at an economical cost.Cast AlNICo Magnets are very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding.Eclipse Magnetics Alnico magnets are ideal for high temperature applications up to 550ºC.