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Dry granulation process and some wet granulation

Why some ingredients undergo dry granulation process and some wet granulation?

 

 

When tablet ingredients are sensitive to moisture and have sufficient cohesive properties, that ingredient undergoes dry granulation whereas ingredients which are not sensitive to moisture and have no sufficient cohesive properties undergo wet granulation.
e.g. Paracetamol (wet granulation)
Aspirin (Dry granulation)

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