... 8%.5.working noise is less than 75 db, less dust pollution.6.suitable for breaking medium hard, especially hard materials ... products are cubic, packing density is big, a very small iron pollution8.little wearing of the impeller , easy maintenance.Description of ... and cement clinker. It can also be applied to crush iron ore, sandstone, plaster, coal gangue, lump coal, limestone, dolomite, granite, ...