- Moisture content-excess moisture tends to collect the spaces between the grains thus decreasing permeability.
- Bonding content also affects the permeability of the sand through the interstitial structure.
- Grain shape-round, angular or compound. The round grains are more favorable for porosity.
- Grain size-varying over the wide range of 50 microns to 3360 microns.
- Compactness-it increases density and decreases permeability.
Properties of Good Moulding Sand
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