Metal Polishing to Mirror Finish and Satin Finishing
Polishing and satin finishing are surface treatments for metals.
They play a crucial role not only in the aesthetic appearance but also in the functional aspects of the material. Metal, whether satin-finished or polished to a mirror finish, will behave differently when exposed to external environmental factors.
The desired finish is achieved using manual, automatic, or semi-automatic abrasives. Our expertise allows us to perform polishing and satin finishing on various types of metals. We carry out mirror polishing and satin finishing of stainless steel, aluminum, brass, iron, aluminum alloys, and others.
We specialize in finishing machinery for the pharmaceutical industries, including sterile sectors, as well as the chemical and food industries.
Differences Between Satin Finishing and Mirror Polishing of Metals
There are several differences between these two types of metal cleaning processes, with the most obvious being the aesthetic aspect. The surface of satin-finished metal has a matte appearance, while mirror-polished metal, when expertly finished, has a reflective and shiny surface. Satin finishing also makes the metal surface less delicate.
The two finishes also differ in their scratch resistance, surface porosity, resistance to chemical attack, and their ability to allow dust and fluids to flow off the surface.
Mirror Polishing of Metals such as Stainless Steel, Aluminum, Copper, Brass
Polishing is a grinding process that makes the metal surface shiny and reflective. It removes all surface imperfections, such as extrusion marks, mechanical processing signs, and other defects.
The process achieves very low material roughness by controlled abrasion of the surface using fine-grained abrasive belts.
In the final phase, steels and metals are treated with a finishing abrasive paste (also available in non-animal fat versions) and cotton wheels. This smooths out microscopic irregularities, giving the surface its characteristic shine.
Manual polishing is achieved by working the metal with polishers and/or grinders. Polishing can be requested with a specific surface roughness value expressed in micrometers.

Satin Finishing of Stainless Steel, Aluminum, Copper, Brass
Satin finishing is a surface treatment that achieves a smooth but matte finish on the metal. This finish can mask any surface defects of the material and eliminate those left by other mechanical processes.
Satin finishing is performed with three-dimensional abrasives. It makes the surfaces matte but maintains a low degree of roughness to prevent bacteria from nesting in the grooves of previous processes.
Satin finishing can also be requested with a precise surface roughness value, expressed in micrometers.
Metal Finishing Certifications and Declarations
The required roughness value for metal polishing or satin finishing can be certified by us through the so-called "scratch test," which is a print of the measured profile.
Our clients can request a declaration on our letterhead, which will include all identifying data of the item in question, calibration data that allows tracing the metrological traceability chain, and measurement specifications to ensure traceability and compliance with requirements.