This　series,our　patent　product,is　used　in　grinding　non-flammable　and　non-explosive　stuff　with　Moh's　hardness　below　9.3,humidity　less　than　6%,such　as　limestone,marble,gypsum,barite,calcite,etc.Fineness　of　final　product　can　be　adjusted　between　80　adnd　425　mesh　and　part　of　them　can　add　up　to　1000　mesh.Through　being　equipped　particular　parts,the　machine　can　produce　coarse　powders　ranging　from　30　to　80　mesh.