Klingspor main catalogue Abrasive, cutting-off & grinding discs Page 374
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Coated abrasives Technical Glossary Grain type Bond / toughness Structure Properties / wear properties sharp-edged, brittle, highly friable / micro-wear Silicon carbide (SiC) very hard / less tough crystalline wedge-shaped, block grain, even wear Aluminium oxide hard / tough crystalline, irregular wedge-shaped, block grain / micro-wear, self-sharpening Zirconia alumina hard / very tough crystalline, even sharp-edged, pointed grit / micro-wear, self-sharpening Ceramic aluminium oxide hard / very tough micro-crystalline Grit type properties and their specific wear properties Definition Description Close coating The entire surface of the backing is coated with grit Semi-open coating Approx. 75% of the backing surface is coated with grit Open coating Approx. 50% of the backing surface is coated with grit In addition, there are also so-called grit agglomerates. This is not an independent grit type, rather it is a grit agglomeration which is comprised of many individual aluminium-oxide or SIC-grits mixed with a resin bonding agent, which together form a large grit. Agglomerates are used almost exclusively on abrasive belts. One differentiates between: The advantage of agglomerates is that they provide an even finish from the first use to the last. Dull grit breaks off from the agglomerate and creates space for new, sharp grit. The objective is to attain an even finish through continual stock removal and an extremely long service life. Open coated grit has a large space between the individual grits, such that the stock removal and the grinding dust can be extracted more easily from the grinding surface. This prevents premature clogging when working on long-chipping materials, such as wood. Coating Moreover, the coated abrasives are coated with different grit coverage densities. The term “grit density” describes the grit coverage density distributed on the backing. 374 ‣ close coating ‣ semi-open coating ‣ open coating The decision as to which grit density to use is primarily dependent upon how great the likelihood is that the grinding dust will clog the space between the grits.
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