Black Silicon Carbide P type for Coated Abrasives: Grit Sizes & Applications

Black silicon carbide is a high-performance abrasive for coated products, valued for its Mohs hardness of 9.15, sharp hexagonal crystals, and excellent adhesion to backings like paper or cloth . Tailored for coated abrasives, it offers a comprehensive grit size range adhering to FEPA, ANSI, and JIS standards, with approximately 40+ regular grades and customizable specifications .

The grit system is categorized by application needs:

Coarse grades (P12–P80/F4–F80): Particles range from 180–2000μm . Ideal for aggressive surface preparation-removing rust, scale, or weld spatter from metals, and shaping cast iron/non-ferrous alloys . 40–60 mesh variants are widely used in skateboard anti-slip sandpaper for strong grip, though they wear soles faster .

Medium grades (P100–P220/F100–F220): 53–180μm particles balance cutting speed and finish. They serve as primary grits for sanding belts/discs, smoothing wood/plastics, and prepping surfaces for painting/electroplating . P120–P150 grades are preferred for automotive body filler sanding .

Fine/Micro grades (P240–P2500/F240–F1200, JIS 240#–6000#): 2–106μm particles enable precision polishing. P320–P600 are used for optical components and semiconductor wafers, while P1000–P2500 deliver mirror finishes in jewelry making . JIS 4000#–6000# micro-grits suit lapping of advanced ceramics .

Notably, P-grit series (sharp, self-sharpening) is purpose-built for coated abrasives, ensuring strong resin adhesion , while F-grit variants are occasionally adopted for heavy-duty coated tools . All grades maintain ≥98.5% SiC purity (up to 99.0% for coarse grits) for consistent performance .