We have a potential large order for an end user in Japan that is wondering if our pumps meet their JIS standard of a 400 grit finish. which compares the polished finish # with the equivalent Ra measurement and grit finish. I am "desperately" looking for a reference chart for polished s.s. The exterior of our pumps are polished to a #8 finish (4 Ra or best effort) for aesthetics, while the interior meets the required 150 grit or 32 Ra finish. My company manufactures stainless steel pumps for the food and drug industry that currently meet 3A surface finish requirements and have 3A certification. If the aluminium you are working on needs to be polished to a high mirror shine – for example, if it is an engine part for a motorbike – this can be achieved with a cloth polishing disc and a good polishing paste.Ī once-over with paste on a polishing disc drill bit will leave the surface of the aluminium mirrored to a high shine.Plating, anodizing, & finishing Q&As since 1989 Two more stages of sanding – with 1200 grit and 2500 grit sandpaper – will leave the aluminium with a very good shine, with no trace of corrosion, casting seams, filing marks or significant abrasions. This process can be done by hand to make sure the paper reaches any tight corners or awkward areas of the aluminium you are polishing. When wet sanding aluminium – with 1200 grit sandpaper and finer – get a bucket of warm water to soak the paper in. The finest grit paper will fill up with aluminium dust very quickly, and it is the finest grit you will be able to use for dry sanding. The next two stages of sanding should be done with 220 grit and 400 grit sandpaper. The second round of sanding will take less time than the first and once it is complete you will really see a difference in the look of the aluminium. Every abrasion made with the 80 grit paper must be removed with the finer paper to bring out the shine of the aluminium. Don’t forget to wear a dust mask! Top Tip: Use a cork block with the sandpaper – it has a little bit of give that will make working on rounded edges far easier.Ĩ0 grit sandpaper will be sufficient at this stage, and once you are happy with the first stage of sanding the next stage can begin – this time with 120 grit paper. This is likely the most time consuming part of the process, but taking the time to smoothen the surface of the material will only improve the finished result. Aluminium is a relatively soft metal, so it shouldn’t take too much effort to level off the surface so you can move on to the next step.Ī coarse grit sandpaper can be used to remove heavy amount of corrosion, dirt and to level out the surface even further. A file will leave deep and very visible scratch marks on the surface of the metal but these will be polished out later as the rest of the aluminium is cleaned up. If the surface of the aluminium has burrs or cast marks, remove these with a file. The lustre of aluminium is one of the key qualities which makes it a popular choice of material for cladding on buildings and other aesthetic applications, so here is our general purpose guide to polishing aluminium. There are a few good guides to be found online about polishing aluminium, many of them about bringing old engine parts to a high shine.
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