APEX-CORAP-Extra = Precious corundum (EK): colour red or white, more than 99 % AL2O3, more brittle than normal corundum. It is suitable for the machining of high-alloy stell as well as heat-sensitive steel because of the high scoring hardness. It is also suitable for sharpening of large surfaces, fpr sharpening of saws, for fine grinding of glass as well as for the sharpening of tools.
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