Why Are there two numbers to the grit size? Equally the ANSI grit standard from the US plus the FEPA grit standard in Europe relate to a median particle size, but use slightly different measurement methods. Our overall aim is to combine the minimal RDS(on) provided by silicon carbide MOSFETs https://www.quora.com/profile/Trevor-Flatcher-2/Comparative-analysis-of-silicon-carbide-and-traditional-silicon-materials-Silicon-Carbide-vs-Traditional-Silicon-Mater-1