Last little bit on this. I have found that this graphite impregnated materiel really helps with abrasive life.
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It reduces friction and therefor heat. I think I got my roll at Klingspor's Woodworking Shoppe but it has been so long I am not sure of that memory. Super unscientific studies in my real world shop indicate that belts last longer. I cannot remember the last time I had a seam fail before a belt wore out.