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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.
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 ...
The building was the location where John Dwan, a Two Harbors attorney drew up the incorporation papers for the Minnesota Mining and Manufacturing Company (now 3M) in 1902. The new company's vision was to mine and process corundum that the founders believed was plentiful on Lake Superior's north shore. The company nearly went bankrupt, because ...
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.
As an indication, ara-to is probably (using a non-Japanese system of grading grit size) 500–1000 grit. The naka-to is probably 3000–5000 grit and the shiage-to is likely 7000–10000 grit. Current synthetic grit values range from extremely coarse, such as 120 grit, through extremely fine, such as 30,000 grit (less than half a micrometer ...
Asset. Allocation. Description. Stocks. 30%. You can divide this portion of your retirement portfolio among broad-market mutual funds and exchange-traded funds (ETFs) that include stocks from ...
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