Question

Classify various types of molding sands and give it’s uses.

Answer 1

1. Special Sand: Uses: Used for cores of brass and bronze casting, for non- ferrous castings of an intricate shape and for heavy steel casting. 

2. Green sand: Uses: It is used only for simple and rough casting. It is used for both ferrous and nonferrous metal. 

3. Dry sand: Uses: They are suitable for larger castings. 

4. Loam sand: Uses: This is particularly employed for loam moulding usually for large castings. 

5. Facing sand: Uses: Facing sand forms the face of the mould. 

6. Backing sand: Uses: To back up the facing sand and to fill the volume of the box. It is also known as floor sand. 

7. System sand: Uses: This molding sand is applicable to mechanical heavy castings.. 

8. Parting sand: Uses: Parting sand is used to keep the green sand from sticking to the pattern and also to allow the sand on the parting surface of the cope and drag to separate without clinging. 

9. Core sand: Uses: Sand used for making cores is called core sand, sometimes called, oil sand.