It's Important to use an alternative with a hardness of more than seven within the Mohs scale; normally, you can just be wasting electricity by working your tumbler. Additional Wonderful Grits (400 �?600+): Excess fine grit sandpaper is used for ultra-smooth finishes and polishing delicate materials. It is commonly used https://www.quora.com/profile/Trevor-Flatcher-2/Exploring-the-High-Temperature-Performance-of-Silicon-Carbide-Special-Ceramics-https-www-macrocosmmaterial-com-news-E