You probably know that sandblasting is the process of smoothing, shaping and cleaning a hard surface by smashing solid tiny particles across that surface at ultra high speeds.
This process is very simple but powerfully effective. Final result is similar to that of using sandpaper, but this technique provides a more even finish with no problems at corners or crannies.
One of the most important parts or components of this industrial technique is the sandblasting grit. Other materials for sandblasting have been developed to be used instead of grit; for example, steel shots, copper slag, glass beads (bead blasting), metal pellets, dry ice, garnet, powdered abrasives of various grades, powdered slag, and even ground coconut shells or corncobs have been used for specific applications and produce distinct surface finishes. The grit used in sandblasting must be sieved to a uniform size.
Therefore, important points to consider regarding sandblasting grit are:
1.- Size and quality of the grit
2.- Methods of grit recovery.
Here you have a video about how powerful is the sandblasting technique.