Green Strength: Property that tells plasticity and strength of the sand once the water has been mixed to it.

Dry Strength : Once the metal is poured inside the cavity, sand adjacent to the hot metal losses its water. It is the strength of dry sand to resist pressure and erosion of the molten metal.

Thermal Stability : this is the property of the sand to remain constant dimensionally under high temperature or heating condition. If the mould surface because of lack of thermal stability crack, buckle or flake off, it shall lead to defective casting.

Resusability:

This is preferred to utilized the moulding sand that can be reused for the number of operations.

Good moulding sand always represents a compromise among conflicting factors. In order to obtain an acceptable compromise of the four fundamental requirements the size of the sand particles, the moisture content, the amount of bonding agent (such as clay), and the percentage of organic matter are all decided. The composition is carefully controlled to assure satisfactory and steady results. (A typical green-sand mixture contains approximate 9% clay, 85% silica sand, and 3% water and 3% organic additives.) As moulding material is frequently reclaimed and recycled, the organic material needs to be added again as a portion of it shall burn throughout the pour. Some of the mould material might have to be discarded and replaced with new.

This is also significant for each grain of the sand to be coated consistently with the additive agents. It is attained by putting the ingredients through a device that kneads, a muller, rolls, and stirs the sand.