the machine is used to grind barite, calcite, potash feldspar, talcum, marble, limestone, ceramics, etc. whose mohs' hardness is below 7 scales and humidity does not exceed 6%. all the stuff is non-inflammable and non-explosive. the product size is adjustable as required in the range of 100-325meshes. now this series has a high ratio in home market. they are popular with cosmic companies and mineral factories. the powder is extremely fine.