Degree of hardness of 9 hours (9h hardness degree 9 = corundum (sapphire) grinding hardness 1000 after rosiwal only the diamond is harder = 10h) This scaring frames the surface and the outer dimensions of the component now only change comparatively little. However, the warmer core continues to contract even more, since the heat expansion above the transformation point is significantly higher than below. A plate is on its surfaces under pressure voltage, while in the middle under tension in between there is a neutral fiber. Due to this frozen preload, the tasted glass can compensate for significantly higher tensile loads than non -treated glass. Since the pressure resistance of glass significantly exceeds the tensile strength, this is an overall improvement. However, a workpiece treated.
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