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Minerios Ouro Branco Calcined Kaolin 0B-2940 is a synthetically modified mineral, manufactured from the calcination of natural kaolin (aluminum silicate). After the calcination process, its crystalline form is modified due to the loss of crystalline water from the molecule, leaving the material whiter, more opaque and abrasive. Inorganic material, chemically inert and benefited in low granulometry.