The impact block is mainly used for protecting the impeller,which is the heart of the sand making machine. It is widely used for artificial sand, in metal and non-metal ores, cement, refractory material, bauxite, silicon carbide, glass material, building material. The finished sand has even particle size, high compressive strength, and high-purity.(http://www.mouldingparts.com/Crusher-parts/Sand-makerSand-making-machine-spare-parts-Impact-block.html)