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ifriction.com comments There are two types of Aluminum Silicates used in friction materials; Kyanite and Kaolin. Kyanite (Cyanite), an aluminum silicate, Al²SiO³, often used in the calcined form will elevate friction levels. Kaolin or China Clay, Al²Si²O 2H²O, are among the orthosilicates used in friction materials. |