Paper backings can stand only minimal flexing, where cloth backings can take more severe flexing. The more popular widths are 4 inches or less. The standard length is 50 yards. Cut sheets are also available to fit all popular portable power sanders. Special sizes can be made to order.
Belts are perhaps the most widely used form of coated abrasive product.
Belt joints are the means by which strips of coated abrasive material are formed into a belt. Belt joints must be at least as strong as the product itself and run as smoothly as possible. Lap joints are made by overlapping and bonding the two ends of the belt material. Lap joint belts can run only in one direction. Therefore, the back of the belt is usually marked with an arrow, indicating the proper direction of travel.