Rigid backsize to prevent fiber disc curling

A coated abrasive article comprising:

• a substrate comprising a plurality of hygroscopic fibers;
• an abrasive layer disposed on a first side of the substrate;
• and
• an anti-curl layer disposed on a second side of the substrate, wherein the coated abrasive article comprises a change in curl between −5 millimeters and 25 millimeters, wherein the change in curl is expressed as the curl of the coated abrasive article in millimeters at 90% relative humidity minus the curl of the coated abrasive article in millimeters at 20% relative humidity, wherein the anti-curl layer comprises a weight of at least 9.0 lb./ream and not greater than 25 lb./ream, wherein the anti-curl layer comprises a majority of urea-formaldehyde, and wherein the abrasive layer comprises a weight of phenol formaldehyde polymer, and the ratio of the weight of the urea formaldehyde polymer of the anti-curl layer is at least 10% to not greater than 100% of the weight of the phenol formaldehyde polymer of the abrasive layer.