Why are there two numbers with the grit size? Both of those 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. On the list of most revolutionary developments was the usage of SiC https://www.facebook.com/permalink.php?story_fbid=pfbid024JwvhFGPd3SjV2LBwx6F989guiNoxoPboAZ3UFZ578tKks6mVBSn7FDgrqGhUcNhl&id=61562415773754&__cft__[0]=AZVEd_GzL8H-zKcErk7V0RNeIHZNXuschoBecsj52E04VIrjwLQhC9ddsHQWBO01orHyweyzpUD1FzyWHl6zfnTB4O3hpCMHTRXOfesmt-TloQqbZMfPmqsySqm5wklmtQoN660Qs5dVcwB25x0_GTvDggZxxRbGax-G8B-2mlVrh5RMheoveYRyEdAxBEHxLnMW1I3pFH1nSF3zbE7iMSsM&__tn__=%2CO%2CP-R