Merit’s resin fiber discs are made with high quality zirconia alumina grain and manufactured with specially formulated bonding resins to minimize loading, glazing, and grain stripping. Zirconia alumina discs perform well on stainless steel, Inconel, and cobalt. It does not break down like aluminum oxide due to the grain’s high strength.
Coated abrasives have individual abrasive grains spaced at a predetermined distance from one another. This is a closed-coat disc. A closed coat covers 100 percent of the surface with abrasive grains, for more stiffness and better surface finish than an equivalent open coat, where abrasive grit covers 50 to 70 percent of the surface. This disc features a resin bond. Resin bonds have good moisture resistance, are harder and less flexible than glue bonds, and have good heat resistance and grain retention. Resin bonds are useful for abrasive operations with high operating speeds, impact, and sudden loading, as the resin bond is strong. The cloth backing is stiffer, tougher, and thicker than a paper or film backing. Cloth resists tearing while bending and flexing during use. This disc is suitable for use with a die grinder. Use with molded-rubber backing pads. Use a hard pad for aggressive cutting, a medium pad for general-purpose applications, or a soft pad for contours and fine finishing work. Loading is where debris gets stuck between the individual abrasive grains, and reduces disc performance by blocking exit paths for the swarf, or chips, of removed material. Glazing is when the disc becomes smooth and glassy, or shiny, and does not cut as well. Glazing is due to heat from grinding reacting with the loaded disc, and is undesirable because disc surface roughness is necessary to grind away material. Grain stripping is when the abrasive grains are pulled from the disc itself, and is undesirable because the surface finish becomes rougher due to the missing grains.
Zirconia alumina is a self-sharpening abrasive that allows for a faster cut rate and longer life than aluminum oxide, due to its ability to fracture and refracture, creating new cutting edges. Zirconia alumina is often used for high stock removal on metals and wood.
Abrasives are used for a variety of applications from shaping a part to fine finishing, depending on the grit size. Low grit numbers like 40 are coarse and are used for removing excess material and shaping a part. High grit numbers like 400 are fine and help to create a smooth surface finish.
Merit Abrasives has been manufacturing abrasives for the deburring and finishing industries since 1945, and pride themselves on their quality and focus on service. Saint-Gobain owns Merit, and has been recognized as a Global 100 Sustainable Company. Saint-Gobain has also earned ISO 9000 and 14001 certification for quality and environmental management standards.