Laboratory Hammer mills Tem. For grinding mediumhard and brittle materials such as clays, grits, fired chamotte, grogs, insulating materials, coal, limestone, kaolins, wastes, etc The degree of fineness depends on the kind of sieve used Production depends on the fineness required and can vary from approx 5 to 30 kg per hour The raw material must have a max particle size distribution of 10/15 mm