Vertical Shaft Impact Crusher (VSI) when should be preffered?

Vertical Shaft Impact Crusher (VSI) should be preferred the materials of high hardness ratio for converting to sand. Also they are used for convert the hard materials to gravel. Vertical Shaft Impact Crsuhers used to gett all the materials which used in construction sector. Other use areas:
In the quarry of limestone, basalt and dolomite
Sand, stone chips and the production of gravel
In the Glass Industry
In the processing of watery, humidity and sticky materials.
This crushers is low-cost thanks to the system of rock on rock crushing. Spare part costs low. They can break small stones particles with high rotor speed. The possibility of wear is low in machine because of rock on rock crushing system. This feature is offer the longer working life for crusher. Energy consumption is low compared to other crushers.