The hardness of abrasive flap disc mainly depends on the amount of the binder added and its density. The higher the density, the higher the hardness. The fact that the abrasive flap disc are easily detached indicates that the abrasive has a low hardness; on the contrary, it indicates that the hardness is high. The hardness grades are generally divided into seven levels: super soft, soft, medium soft, medium, medium hard, hard and super hard. From these levels, several small levels can be subdivided. The method for determining the hardness of the abrasive flap disc is more commonly used by a hand cone method, a mechanical cone method, a Rockwell hardness tester method, and a sand blast hardness tester. The hardness of the louver has a corresponding relationship with its dynamic elastic modulus, which is advantageous for determining the hardness by measuring the dynamic elastic modulus of the louver by an audio method.
During the grinding process, if the material hardness of the workpiece is high, the abrasive flap disc with low hardness is generally selected; if the material hardness of the workpiece is lower, the abrasive flap disc with higher hardness is generally selected
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