Correct Answer - Option 3 : Cohesiveness
Explanation:
Properties of moulding sand
1. Collapsibility:
- It is the ability of the moulding sand to collapse after the casting solidifies, there are additives added to the moulding sand, like wood flour which will burn at a higher temperature and when the casting tries to contract itself it doesn't offer any resistance due to empty spaces left by burnt-out additives.
2. Porosity or permeability:
- It is that property of sand which permits the steam and other gases to pass through the sand mould.
3. Plasticity:
- It is that property of sand due to which it flows to all portions of the moulding box or flask and acquires a predetermined shape under ramming pressure and retains this shape when the pressure is removed.
4. Adhesiveness:
- It is the property of the sand due to which it adheres or clings to the sides of the moulding box
5. Cohesiveness:
- It is that property of sand due to which the sand grains stick together during ramming.
6. Refractoriness:
- It is that property of the sand which enables it to resist the high temperature of the molten metal without breaking down or fusing.
