This decision is made by knowing the type of material you will be working with.
Open Coat – Here, the abrasive granules cover from 50% – 70% of the backing and are set at pre-determined spacing to reduce loading. Used on softer surface materials that tends to load or fill the abrasive surface.
Closed Coat – Here, the abrasive granules cover virtually the entire backing surface. Used where loading of abrasives is less of a problem.
How do i prevent moisture contamination in the abrasive?
Moisture contamination is the number one reason customers call Technical Support. Fortunately, it is usually preventable. There are 4 key ways to keep your abrasive free of moisture:1.Store abrasive properly and always make sure bottles are tightly closed