Elma tec clean S1 is suitable for non-ferrous metals, aluminium, stainless steel, synthetics and glass, also suitable for the passivation of chrome alloy stainless steels. - Lightening effect on brass and alloys containing copper. - Removes mineral oils and fats, oxide layers (e.g. verdigris), as well as rust and limescale. The passivation effect on Cr steels is produced by the detachment of Fe atoms from the surface, resulting in an increase in the relative Cr content.