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- It is free from air, moisture or impurities .
- Impurities tend to segregate at grain boundaries .
- This impurity must be purged away after death .
- The buildup of impurities often results in defective plating .
- The impurities present have an important effect on the rate of setting .
Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound.