Ground into various sizes from pure muscovite mica, PREMICAâ„¢ mica flakes are greatly sought after by industries involved in manufacturing oil drilling machinery, brake linings, clutch facings and acoustic speakers. PREMICAâ„¢ flakes are absolutely free from any contamination and are seen as a safe alternative to asbestos. PREMICAâ„¢ flakes are also used for decorative purposes because of their natural lustre.