The hammer mill is used to reduce the sample size, previously crushed to 5 mm size with the Laboratory Crusher, in order to perform various tests as, for instance, the chemical properties of aggregates. The material passing to the 1 mm screen goes down practically to powder. The grinding operation is obtained by  the combination of three efforts: impact, shear and rebound. After entering the grinding chamber through the hopper, the material reaches the required fineness down to 1 mm and through the filtering hoses arrives to the collector. The machine is supplied complete with screens of 3, 2 and 1 mm opening.

This is one of the apparatus required to obtain particles that pass through 300 µm sieve, Laboratory Crusher and Jar Mills in links to other products below.