Are there any special treatments for coated abrasive during the manufacturing process?

Some products are given additional special treatments during the manufacturing process in order to make them even more suitable for specific applications. Such treatments include
No-File and PSA.

No-File Treatment
In order to provide even better resistance to loading, some open-coat paper products are given a special surface treatment of zinc stearate after the sizing operation. These products are ideal for sanding between sealer coats on furniture, sanding after primer coats on automobiles, removing varnish from wood, and numerous other operations where conventional abrasive
products fail prematurely due to loading.

PSA (Pressure-Sensitive Adhesive) Treatment
Some paper and cloth products have a special PSA coating applied to the reverse side of the backing. This offers peel-and-stick convenience and eliminates slippage between the sander back-up pad and disc. Discs are mounted on the rotating plates of table top grinders, the backup pads of portable grinders or the pads of special vibrating sanders.