3M Precision Grinding & Finishing 3M Conventional
2016-12-6u2002·u2002ing off of the abrasive grit. The softer the wheel, the easier it is for the abrasive grit to break off. Let-ter codes A (soft) – Z (hard) refer to the hardness grade (see the table). The wheel hardness also depends on the grain size and porosity. In a given wheel hardness range (for example hardness F), a grinding wheel with small grains and ...
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