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Concentration is a term applied to superabrasive grinding wheels that refers to the amount of abrasive contained in a unit volume of usable grinding wheel. A concentration of 100 corresponds to 72 carats in a cubic inch of wheel in the effective superabrasive volume of the grinding wheel. The concentration values are usually between 30 and 175.
The desirable concentration depends on the projected area of wheel contact with the workpiece material. A large area, as in flat surface grinding, would call for a low concentration. A limited contact area, such as is found in most tool and cutter grinding applications, would call for a relatively high concentration. It is important to match the concentration to the application.
Workpiece materials like glass that are likely to chip while being ground need a low concentration.

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