Sanding discs are available in a variety of different backings, the most common of which are cloth, film, hook & loop, and PSA (Pressure Sensitive Adhesive). Each one is designed to support quality results for certain materials and applications, so choosing the right one for its intended purpose is important for the best results. 

In this article , we introduce cloth backing of sanding disc and outline how to choose the best material for your next project.

CLOTH

Cloth-backed abrasive discs may be made from natural fibers like cotton or synthetic materials like rayon, polyester, and nylon. The backing material has to go through a shrinking , drying, and stretching process, in order to gain the flexibility and strength needed for its intended use.

Standard cloth backings have letter codes that indicate their strength and flexibility. Your options are:

JF: As the lightest and most flexible cloth backing, F-weight is recommended for sanding workpieces with a more complicated or intricate profile.

J: This backing has the flexibility to and durability of jean fabric. Although not rugged enough for stock removal, it ensures a smooth and uniform finish, making it appropriate for curved or contoured surfaces.

X: Stiffer and more rugged than J-weight backing, X-weight can be used on abrasives designed for everything from stock removal to finishing and polishing.

YY: Being the strongest cloth backing available, Y-weight appears on coarse grit abrasives that perform heavy stock removal or extreme-pressure applications.

If you do a lot of stock removal, work with hard surfaces like metal or hardwoods, or need a more flexible abrasive backing for rounded or contoured profiles, cloth-backed abrasives can deliver the results you need without tearing or deteriorating.

ADVANTAGES

Durable performance

Resists tearing better than paper backing

Can be washed to clear away resin and buildup

Won't degrade when exposed to grease or oil

DISADVANTAGES

More expensive than paper backing