![]() Most of the studied abrasive particles should be within the specific range (between the minimum and the maximum). The average grain size does not fall within the center of the range. Two very different abrasives may have the same average value. The purpose of PSD is to answer simple questions like: what is average, maximum and minimum size of particles? PSD of any particular abrasive is the integral function. Grit Valuedefines the Particle Size Distribution (PSD). How do you classify an abrasive powder consisting of billions of particles of varying sizes?Ĭlassifications introduce an element of order into this chaotic world of statistics. Even if the manufacturer carefully sorts the abrasive particles by size, there will always be a certain range of sizes. In the real world, abrasive particles are never the same size, since some will be larger and others will be smaller. In the world of ponies and butterflies (which, by the way, is where many manufacturers’ marketers live), all particles are the same size. For example, FEPA-F defines the grit values 8, but there are no grit values 801 or 900.Īny abrasive (whether solid, paste or powder) consists of a huge number of particles.
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