Either aluminum oxide, garnet, or silica, depending on the type of paper. Different sized grains of each give you the different grits. Hope this helps.
http://ph.answers.yahoo.com/question/index?qid=20090124...
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Sandpaper consists of a flexible paper backing, with a film of adhesive (glue) that holds and supports a coating of abrasive grains. Sandpaper belongs to a class of materials called "coated abrasives." The first record of a coated...
http://www.enotes.com/science-fact-finder/metals-other-...
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Although the most familiar types of coated abrasives are probably the individual sheets of sandpaper with which home woodworkers prepare furniture or crafts for painting, the trade term "coated abrasives" actually encompasses a much wider array of products for both individual ... Home > How Products are Made > Sandpaper...
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www.enotes.com/how-products-encyclopedia/sandpaper
www.enotes.com/how-products-encyclopedia/sandpaper
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Sandpaper - Wikipedia, the free encyclopedia
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Sandpaper is a form of paper where an abrasive material has been fixed to its surface. Sandpaper is part of the "coated abrasives" family of abrasive products. It is used to remove small amounts of m...
en.wikipedia.org/wiki/Sandpaper
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Sandpaper works a lot like a saw, chisel, or any other cutting tool in your shop. The particles on sandpaper are made up from a number of sharp edges that cut the wood the same way a saw blade does. The only real difference is that sandpaper, unlike your saw, can’t be sharpened.
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www.abrapower.co.uk/sandpaper.htm
www.abrapower.co.uk/sandpaper.htm
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How Products are Made: How is sandpaper made? ... sandpaper, abrasive originally made by gluing grains of sand to heavy paper sheets. Today sandpaper is made primarily with quartz, aluminum oxide, or silicon carbide grains, and is graded according to the size of the grains.
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www.answers.com/topic/sandpaper
www.answers.com/topic/sandpaper
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Pat Logan Lifestyle Columns - Sandpaper Made with True Grit ... Lifestyle> Home And Garden> Heres How> Sandpaper Made With True Grit ... There are several kinds of abrasive materials with which sandpaper is made.
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www.creators.com/lifestylefeatures/heres-how/sandpaper-...
www.creators.com/lifestylefeatures/heres-how/sandpaper-made-with-true-grit.html
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sand sand Garnets are used for the best sand paper. http://en.wikipedia.org/wiki/Garnet
http://wiki.answers.com/Q/What_is_used_to_make_sandpape...
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www.answerbag.com/q_view/85513
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