Backing

Paper or cloth backing is measured by weight, which is determined by the tensile strength of the backing.

Paper

The weight and flexibility of paper backings are represented by the letters A-E. A and B are lightweight and highly flexible. C and D weights are medium to heavyweight for more strength and less flexibility. E weight is a strong, durable heavy paper stock coated in a complete range of grit sizes, primarily used for mechanical sanding operations.

Cloth

There are two common types of cloth backings. One is a heavy, strong, relatively stiff material. It is used in coarse grit belts for heavy stock removal on straight or flat surfaces. The other is a lighter, less strong, relatively soft and flexible material known as J weight or jeans cloth. It is used in finishing work or contour work on curved surfaces where finish and uniformity are more important than stock removal.

Bond

Bond is the agent used to hold the abrasive grains onto the backing. It is usually a combination of layers of adhesives. Resin is a synthetic adhesive used as a bond. Resins are strong and resist moisture and heat build-up. Glue, which is traditionally made from animal hides, is another type of an adhesive used as a bond. Make coat is the initial layer of adhesive into which the abrasive grains are embedded. Size coat is the secondary layer of adhesive that covers the majority of the abrasive grains.

Above Power sanding pads and discs with Velcro fixing.

Was this article helpful?

0 0
Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

Get My Free Ebook


Post a comment