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The electropolish process is the removal of substrate (base) material in such a fashion as to impart a highly reflective surface in most cases; diminishing scratches, burrs and unwanted sharp edges from most metals. Electropolishing is most frequently used on stainless steel, relatively high in both nickel and chromium content (300 and 400 series). Finishes from satin to mirror bright are produced by controlling time, temperature, current, bath make-up or singularly or in combinations. Surface appearance results are also dependent on pre-process condition. Typical material removal .0002" per surface, unless otherwise specified. Processing of close tolerance surfaces requires a significant amount of vigilance from the plater: there is no undoing the results. As an adjunct, the electropolish process creates a super-passivated surface of the base metal, maximizing the corrosion resistant properties of the particular alloy. 
Medical components; food processing machinery; pharmaceutical filling devices; complex stainless details; computer peripheral parts; aerospace technologies. More extensive reading.
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Revised: 9-2-2001