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High-Efficiency Grinder Grinding Wheel Sic Powder Black Silicon Carbide Micropowder. Extreme Hardness: Mohs hardness 9.2 and HV3100-3300 microhardness for superior grinding efficiency. Precision Polishing: Ideal for electronic, semiconductor, optical glass, and sapphire polishing. Stable Supply: Daily production exceeds 30 tons with customized packaging options. Customizable Sizes: Available in Grain, Grit, and Powder shapes with flexible customization.