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Scotch-Brite is an abrasive cleaning line manufactured by 3M. The original product consists of spinning polypropylene fibers with variations of about nine grits. Scotch-Brite also contains "Alox", which is the trade name for aluminum oxide. Although polypropylene may be considered soft, its composition with aluminum oxide greatly enhances its abrasive strength; To the extent that a Scotch-Brite board will actually scratch the glass. Aluminum oxide has one of the highest hardness coefficients of all oxides, though much more expensive diamond abrasives still exceed it in hardness.
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