Explain sand and moulding sands, Mechanical Engineering

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Q. Explain Sand and moulding sands?

Sand according to the amount of clayey matter they contain, the moulding sands are classified as:

• Silica sand: Up to 20% clay.
• Lean or weak sand: 2 to 10% clay
• Moderately strong sand: 10 to 20% clay
• Strong sand: Up to 30% clay
• Extra strong sand: Up to 50% clay.

There are three types of sand used for making moulds: natural, synthetic and chemically coated.

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