To engineer a scratch-resistant glass, you need to know the best way to test a scratch-resistant glass. Corning scientists determined the Knoop Diamond Test is an accurate way to measure scratch resistance. In this test, a Knoop diamond is slowly forced along the glass surface to intentionally create scratches. The load, or pressure, of that diamond is also slowly increased. We look for a lateral crack to appear and then identify the load that caused the scratch. The higher the load, the more sc
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