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What is ACT on the back of your belts? Advanced Coating Technology: A proprietary coating technology Klingspor Abrasives applies to improve the properties of coated abrasives. The ACT allows for more grain exposure (Less Resin in the Size Coat & Longer Service Life) better edge wear on belts/discs and more aggression throughout the grit range. When used for wood, ACT prevents the premature clogging of the coated abrasives and significantly increases the service life. When workin …