Why are there two numbers for the grit size? Both the ANSI grit standard in the US and also the FEPA grit standard in Europe relate to a mean particle size, but use slightly different measurement methods. The earliest electrical application of SiC was for a surge protection in lightning https://www.facebook.com/permalink.php?story_fbid=pfbid0TQxdDrEw2QBDdBiTLRwtSVDMK67p7cEebAmUfcW2zdNWdKoBZhwWHts6KSR8v7fKl&id=61560512640678&__cft__[0]=AZVQbUvIrOYQ1vVgfIFsWEaNI4oChHMznkvA098JPWtzGHMO2Z92CTgAZ8IT2bSubj4ehPjT8GEkn3Vd5Fi9T8ISVN6raiTBNtugf8IRalarjQpEnfX5gGE_9KiaErmzR0l3cRSFO0dLrmHUFYfsBYUJyxtRqPGJVse7jbIXSJFkmncCSn-dVYY-RFpP8DRCXqD-vzG6a1L-td14sDUV74QU&__tn__=%2CO%2CP-R