How To Mill To Ultra Fine. Scm ultrafine mill application.Scm super-micro mill is mainly used to produce fine powder and super fine powder.It is applicable to non-flammable and non-explosive materials with hardness less than 6, such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, magnesite, illite, pyrophyllite, vermiculite, sepiolite, etc.