Electric discharge machining is a metal removal process involving the removal of material from the work piece by a series of controlled electric discharges or sparks. The tool and the work piece are insulated by a special dielectric fluid. These fluids are formulated with a highly refined, narrow cut paraffinic base stock with excellent oxidation stability which helps reduce the formation of oxidation products that will alter the dielectric strength of the fluid. The product is colourless and virtually odourless. The product exhibits a relatively high flash point that helps to reduce the possibility of fire. The low viscosity of the fluid provides good circulation through the spark gap and more rapid removal and settling of metal fines.