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6. Does dry ice blasting cool the base material? Is this desirable? Will it damage the base material?
Cooling impacts cleaning and base materials in this manner:
 Some cooling takes place in the base material, but the amount of cooling seldom exceeds -4O°C below its initial temperature. The likelihood of damage due to cooling is remote. Experience in cleaning hot tools shows that the cooling does not cause any harm to the tooling.
For a few kinds of applications cooling makes a small contribution to the cleaning process, principally with those contaminants that break up more easily due to thermal shock, e.g. those with high moisture content or a high freezing point. Most of the cleaning results from good velocity/kinetic energy, hard pellets, and the impact-flushing action described in the first question.
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