Tech Readers
Liquid-like reflectivity is what a perfect super mirror finish stainless steel has. Surface so perfect that it shows no distortion at all. The No. 8 mirror finish is what makes it unique – it’s the best polish you can ever get.
Achieving this near-perfect state is not as easy as a simple wiping. It involves a meticulous procedure comprising of several steps and requires both mechanical and chemical processes. Each and every one of the procedures should be performed in exactness in order to achieve the best possible final outcome.
A Perfect Basis
The No. 8 mirror finish process begins not with polishing, but with the raw material itself. We start with the high-quality cold-rolled stainless steel sheet having either No. 2B or Bright Annealed (BA) finish.
As fabricators, we carefully choose and inspect this basic material. Hidden defects such as tiny pits, roll marks, or other base material issues cannot be “polished out” at a later stage. These defects indeed worsen and become more noticeable throughout the polishing process.
The careful selection of the perfect materials to start is the first step that cannot be ignored. This is the only way that one can be certain that the final product’s surface is really perfect without any distortion.
The Polishing Stages
The main task of the process is the stepwise improvement through meticulous scraping and grinding. It is a controlled expedition with several stages, not just a single move. To achieve a true No. 8 finish, the standard set by ASTM has to be non-directional and very reflective.
In order to attain this result, we use a series of increasingly finer grinding materials. The precise arrangement of grits we employ is our commercial secret, but the process tends to initiate with around 180 grit in order to level the surface.
We then proceed systematically through materials like 240, 320, 400, and frequently, we go as high as 600 or more. Each level must entirely get rid of all the scratches from the previous step. Hurrying or bypassing any of the stages will cause long-term problems like polishing marks or ghost lines that will completely ruin low-quality finishes.
Buffing to Perfection
After the last grinding stage, the surface is smooth but not yet at the mirror clarity level. The last alteration occurs during the buffing stage, where the craftsmanship and science meet.
Traditionally, we use big, soft cloth mops with special cutting and coloring compounds that mainly come from alumina or cerium oxide.
The operator’s skill, the amount of pressure they apply, and the compound quality are factors that count a lot in this process. This last stage eliminates any residues and creates the shiny, mirror-like surface which characterizes super mirror finish stainless steel with brightness and clarity of the image to perfection.
Proof of Excellence
Finishing a No. 8 mirror to perfection is our confirmation of the fact that we wrap up every step of our process in a thorough and systematic manner. This entails diligent tests of the raw materials until the final buffing operation.
In the final conclusion, the absence of nearly invisibly related defects like haze, cloudiness, and polishing marks is purely obtained through the skill and experience of a supplier. When you select a supplier of high quality, you are assured of a perfect outcome for your project.
