Safe to machine and/or grind steel, cast iron, aluminum, brass, copper, galvanite, carbide, stainless steel and the modern alloys in the nuclear and aeronautical fields. Leaves a thin rust preventative film on the machines and parts to inhibit rust and corrosion of parts stored indoors. The odor counteractants formulated into SemiCut, along with the tight micro-emulsion characteristics result in odor-free operation. No "Monday morning stink" or bacterial slime builds up on the machines or parts.