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Cheap sandpaper was often passed off as glass paper; Stalker and Parker cautioned against it in A Treatise of Japaning and Varnishing published in 1688. [5] In 1921, 3M invented a sandpaper with silicon carbide grit and a waterproof adhesive and backing, known as Wet and dry. This allowed use with water, which would serve as a lubricant to ...
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When Drew joined 3M in St. Paul, Minnesota in 1921, it was a modest manufacturer of sandpaper.While testing their new Wetordry sandpaper at auto shops, Drew was intrigued to learn that the two-tone auto paintjobs so popular in the Roaring Twenties were difficult to manage at the border between the two colors.
Grit size ranging from 2 mm (the large grain) (about F 10 using FEPA standards) to about 40 micrometres (about F 240 or P 360). These minerals are either crushed or are already of a sufficiently small size (anywhere from macroscopic grains as large as about 2 mm to microscopic grains about 0.001 mm in diameter) to permit their use as an abrasive.
Grit, one of the byproducts of grinding, an abrasive machining process Grit removal , the removal of grit, the coarse abrasive material in untreated sewage Grit size table , fineness/coarseness classification of sandpaper grit, and compares the CAMI and "P" designations with the average grit size in micrometres (μm)
Searching the internet, I am having difficulty locating grit size information for ultrafine microgrit papers beyond CAMI 1000. Papers in grades 2000, 3000, 5000, 8000, 10000 and 12000 can be found, but size information for the grit particles of these grades seems nonexistent.
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