Desirable plasticity at the Time molding.
Desirable mold Permeability.
Being polished, the surface of produced shapes.
High sintering point and high level of not causticity.
High dry compressive strength.
High tensile strength.
High mold hardness.
High yield strength
Few roughness on castings
High purity rate( 98% SiO2)
Void of volatile substances.
No chemical burning sand.
Decreasing Gas defects
Decreasing pin holes
Hot shell tensile strength increasing
Thermal expansion decreasing
Great collapsibility
Mold atmosphere control