![]() You might be wondering, “does that mean I need to stock all the grits, from 24-2500 at all times?” This is much more easily explained in the following graphic: Depending on the material, we offer products from P24 all the way to 10,000. P100), where coarser, or larger grains, have a lower number and finer, or smaller grains, have a higher number. There are different systems out there, and typically, Uneeda’s products follow the FEPA standard, in which grit is denoted by the letter P and then a number (e.g. With the sieve number, grain size is determined by the number of meshes per inch, whereas with micro grains, the size is determined by the sinking speed during sedimentation. The sizes are standardized and determined by two main methods: sieve number or micro grain. Coatings.)Ĭoated abrasives, such as sanding belts, discs or sheets, come with a variety of standard grain sizes, more commonly known as grit, or grit size. (You can learn more about these other elements in the linked articles. I’ll be adding to this chart as I get more statistics, but this chart is a good first stab.īelow you can download an Excel spreadsheet (and modify it if you please) and a pdf of the chart for those readers who aren’t chartered accountants.Sandpaper, or coated abrasives, as the broader category is known, are composed of abrasive grains, adhesive and a substrate backing. Please keep in mind that these are published statistics I have no way (or desire) to measure the actual particle size or consistency of the media. – Other stuff (diamond paste, green compound, ceramic diamond media) – Man-made stones (silicon carbide and aluminum oxide) So with the help of readers and published statistics, I’ve put together a spreadsheet of common sharpening media and converted them to microns for you. So the smaller the number in microns, the finer the grit. One micron is one-millionth of a meter (hey, I just used the metric system). A micron is a measurement of the diameter of each particle of grit in your stone and paper. Now I don’t want to bore you with a discussion of microns, but here’s the short explanation. The good news is that you can convert all sharpening media to microns and get a better picture of where your sharpening stone or paper is in the continuum from cinderblock (coarse) up to baby’s behind (very fine). Your edge won’t improve when you move to the extra-fine stone. Well good luck, both of these stones are the same grit (22 micron). Here’s an example: Say you want to use a soft Arkansas oilstone as your coarse stone and an extra-fine India (aluminum oxide) stone to finish things up. Just start with the coarse media and proceed to the fine one.īut if you start mixing brands or systems, you can get in trouble. If you stick with one system and one brand (say, you use Norton waterstones exclusively), this isn’t a problem. The reason is that sandpaper, waterstones, oilstones, diamond stones and silicon carbide stones all use different systems to tell you how coarse or how fine the material is. (Heck, #1,000-grit sandpaper in the United States isn’t the same as #1,000-grit sandpaper in Europe.) ![]() A #1,000-grit waterstone isn’t the same grit as #1,000-grit sandpaper. Your edges get keener but you get more confused about the “grits” used in the process. Once you get serious about sharpening, two things happen.
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