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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

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The particle size is important since very fine abrasives are used to polish lenses of all types so there are no scratches. If the polish is too coarse the lens will have scratches, and if it is too fine, processing time will increase. In the polishing industry, it is very important to have a very narrow particle size distribution for maximum productivity. The disks used on computer hard drives are polished with very precisely milled abrasives. Abrasives in toothpaste are another example; they must be aggressive but not enough to remove enamel.
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