This decision is made by the type of abrasive you have selected or the type of process you will be performing.
Glue – A straight animal hide glue that is used to adhere the abrasive particles to the backing. Referred to as “Glue Bond”.
Resin – A synthetic resin that is used to adhere the abrasive particles to the backing. This type of bond is resistant to heat and moisture and is referred to as “Resin Bond”.
Coarseness of the abrasive mineral:
Commonly referred to as “grit”, this number designation is determined by the amount of abrasive mineral that can pass through a mesh screen with specific size openings. Therefore, a 40 grit abrasive particle will pass through a mesh