During casting, the high temperature of molten iron will cause the moisture on the surface of the wet sand mold to migrate outward and leave the sand mold in the form of water vapor, so the sand mold needs to have proper air permeability.
AFS Grain Fineness Number AKA AFS GFN
Surface Stability Index AKA SSI
Total Clay Content
Green Sand Mulling
Compactability,aka CB & Standard Speciment
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