What grits you’ll need, and in what format of product (belt, disc, sheet, etc.) will depend greatly on your sanding application. 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. Sandpaper, or coated abrasives, as the broader category is known, are composed of abrasive grains, adhesive and a substrate backing. But, first, let’s discuss the basics of grit. But, when we cut corners, it definitely shows in the finish… Why? Well, we’ll get to that. We know as well as anyone that sanding through the grits can be a tedious affair, and we’d all rather be doing something else. Whether you’re new to woodworking – and therefore, sanding – or you’ve been around for years, choosing the right grit sequence is key for achieving a beautiful, even and smooth finish. Why You Should Follow The Golden Rule Of Sanding (or how sanding works).
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