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How to analyze the quality of the abrasive paper with your eyes?

1. See whether the paper pretreatment is good or not. Bad pretreated abrasive paper has black dots on the back side when backlighted. This kind of abrasive paper will
be brittle and has poor waterproofness.
2. See whether the grain side is smooth or not and with too much bond or not.
If the grain side is with too much bond, it feels not sharp since the bond has fully covered the grains. And also the
grain side will be shiny when it is with too much bond.
3.See whether there are coarse particles or abnormal bulges on the grain side. These will damage the workpieces
during sanding.

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