What abrading media is required in the ASTM C-704 abrasion-resistant test?

ASTM C704 specifiessilicon carbideas the standard abrasive media used in the abrasion resistance test for refractories. This test simulates service wear caused by mechanical erosion (e.g., in FCC units). Silicon carbide is used because of its consistent hardness, angularity, and wear characteristics that represent severe operational conditions.