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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.
Soda–lime glass (for containers) [2] Borosilicate (low expansion, similar to Pyrex, Duran) Glass wool (for thermal insulation) Special optical glass (similar to Lead crystal) Fused silica Germania glass Germanium selenide glass Chemical composition, wt% 74 SiO 2, 13 Na 2 O, 10.5 CaO, 1.3 Al 2 O 3, 0.3 K 2 O, 0.2 SO 3, 0.2 MgO, 0.01 TiO 2, 0. ...
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.
Is it possible to live comfortably in retirement on Social Security income alone? Yes and no. Alden and Dena Swartz draw nearly $4,000 a month from Social Security, the government program designed ...
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