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Sandpaper or glasspaper 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 material from surfaces, either to make them smoother. The first recorded instance of sandpaper was in 13th century China when crushed shells, seeds, and sand were bonded to parchment using natural gum. In 1916, 3M invented a type of sandpaper with a waterproof backing, known as Wetordry.