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Grindability Tests The Cement Grinding Office Mill diameter 305 mm (12") and length 305 mm (12") with rounded corners and a smooth internal lining. ,Speed of rotation: 70 rpm.Later on the use of the Hardgrove grindability Test (HGI) has been has extended to other materials.This test seems to be well adapted for VRM (Vertical Roller Mills).4.4,Other tests:. 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