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the grit of flap disc
Jan 12, 2018

Grit refers to the size of abrasive, the size of which is indicated by the grit size. GB specifies the abrasive and powder two grit size number.


Grit refers to the size of the abrasive size. Granularity is divided into two types of abrasive and powder. For large grit size cylindrical grinding wheel in the 40μm abrasive, known as abrasive. Grading with a screening method, the grit size number is expressed as the number of pores per inch of the screen through which the abrasive passes. For example, 60 # abrasive grain means that it is just about the size of a 60-mesh screen per inch of length. Abrasives that have a grit size of less than 40 μm are called fine powders. Grading with microscopic measurements, with W and subsequent numbers indicate the size number, the value after W represents the actual size of the fine powder. Such as W20 that the actual size of the powder is 20μm.


The hardness of the abrasive depends mainly on the amount of binder and the density of the abrasive, abrasive easy to fall off that abrasive hardness is low; the other hand, that high hardness. The hardness level is generally divided into super soft, soft, soft, medium, hard, hard and superhard seven major categories, from these levels can also be subdivided into a number of small. Determination of abrasive hardness method, the more commonly used hand cone method, mechanical cone method, Rockwell hardness and sandblastometry hardness measurement method.


Abrasive hardness and dynamic modulus of elasticity has a corresponding relationship, which is conducive to using audio method to measure the dynamic modulus of abrasive to indicate abrasive hardness. In the grinding process, if the material being ground workpiece hardness is high, the general choice of low hardness abrasive; the other hand, the choice of high hardness abrasive.


For our flap disc, the common grit size is 36#, 40#, 60#, 80#, 100#, 120#, 150#, 180#.


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