Technical Data
Fasteners     Abrasives    
Bond Techniques

The grains are locked to the backing material using a bond technique that involves a two layer process. There are three major typesof bond techniques used in coated abrasives:

Resin over Resin
A very strong bond resistant to heat and moisture. Resin over resin bonds are durable for heavy stock removal and is by far, the most popular bonding method.

Resin over Glue
A bond that is resistant to heat. It is more aggressive than glue over glue bonds and leaves a finer finish than resin over resin bonds.

Gue over Glue
A bond that is less durable than resin bonds, but glue over glue bonds produce a more uniform finish. Glue over glue bonds soften under heat, thereby reducing the life of the product.

All coated abrasives are stiff and rigid after the drying and curing of the bond. To achieve the flexibility required for the application, a mechanical flexing process is required. This process is actually a controlled cracking of the bond in one or more directions to achieve the desired flexibility.

Open Coat vs. Closed Coat

These terms refer to the spacing between the abrasive grains bonded to the backing.

Closed Coat
Closed coat means the abrasive grains are adjacent to each other with no space between. The majority of applications will benefit from closed coat material because it allows for more material removal.

Open Coat
Open coat means the grains are set apart from each other, achieving a surface coverage of about 60% or more. In situations where loading is likely (soft, non-ferrous materials, painted surface, wood, etc.) open coat will resist loading and clogging and extend the useful life of the abrasive.