Castrol IlocutTM EDM 401 is a medium viscosity mineral oil based high performance electric discharge machining (EDM) fluid, designed to enable optimum rates of metal removal, together with low electrode wear, good surface finish and fine tolerances. It is especially formulated to provide exceptional performance in all spark-erosion applications.Ilocut EDM 401 is recommended for use on all ferrous and non ferrous metals. It is designed for large electric discharge machines and is particularly suited for roughing operations where high rate of metal removal is required.