When manufacturing a variety of clinker fireclay brick products, the content of Al2O3 is 25~30%, good plasticity clay; when the production of ordinary cement products, the Al2O3 content is 30~35%, poor plasticity clay.

The combined with the clay size requirements, in general, the more detailed the better. Because of different molding methods, the combined with the clay size requirements are also different. Production of plasticity, combined with the clay size can be larger, usually 0.6~1.0mm, with half dry molding, combined with the clay size preferably not more than 0.2~0.5mm, used for binding clay preparation of mud, combined with the clay size range of 2~5mm, the particle size of clay in water as dispersing ability and.