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Metal Polishing Services:

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We provide the following finishes on aluminum, brass, copper, steel, stainless steel, and other alloys.

Please contact us with any questions you may have.

  • #3 Finish - Also known as grinding, roughing, or rough grinding. These finishes are course in nature and usually are a preliminary finish applied before manufacturing. When the finish is specified as #3, the material is polished to a uniform 60-80 grit.

  • #4 Architectural Finish - Also known as brushed, directional, or satin finish. The #4 architectural finish is characterized by fine polishing lines that are uniform and directional in appearance. It is produced by finishing the metal to a #3 finish, then polishing the metal with a 120 - 180 grit belt or wheel finish, then softened with a medium non-woven abrasive belt.

  • #4 Dairy or Sanitary Finish - This finish is commonly used for the medical and food industry and almost exclusively used on stainless steel. This finish is much finer than a #4 architectural finish. The finish enhances the physical appearance of the metal as well as increases the sanitary benefits. We take great care to remove any surface defects in the metal like pits, that could allow bacteria to grow. A #4 dairy or sanitary finish is produced by finishing the metal to a #4 architectural finish, then polishing with a 180 - 240 grit belt, softened with a fine non-woven abrasive belt or pad.

  • #6 Finish - Also known as a fine satin finish. This finish is produced by finishing the metal to a #4 dairy or sanitary finish, then polishing with a 220 - 280 grit belt or wheel softened with a very fine non-woven abrasive belt or pad. Polishing lines will be soft and less reflective than a #4 architectural finish.

  • #7 Finish - Is produced by finishing the metal to a #6 finish, then polishing with a 280 - 320 belt or wheel and sisal buffed with a cut and color compound. This is a semi-bright finish that will still have some polishing lines but they will be very dull. Carbon steel and iron are commonly polished to a #7 finish before chrome plating.

  • #8 Finish - Also known as a mirror finish. This finish is produced by finishing the metal to a #7 finish, then polishing with at least a 320 grit belt or wheel. Care will be taken in making sure all surface defects are removed. The part is cut and color buffed to achieve a mirror finish. The quality of this finish is dependent on the quality of the metal being polished. Some alloys of steel and aluminum cannot be brought to a mirror finish. Castings that have slag or pits will also be difficult, if not impossible, to polish to a #8 mirror finish.

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