Effect of sand fraction on properties of moulding sands
The effect of the quartz sand fraction on the technological, physical and mechanical properties of sand-clay moulding sands is studied. It is shown that the use of coarse-grained sands makes high strength properties and gas permeability to sands, but lowers fl uidity. The using of fi ne-grained sand makes the casting surface smooth, but moulding sands based on such sands have lower strength properties and low gas permeability.