Degree of hardness of 9 hours (9h hardness degree 9 = corundum (sapphire) grinding hardness 1000 after rosiwal only the diamond is harder = 10h) Please note because this film was made of hardened real glass and was deliberately left space to the edge of the smartphone 1-2 mm. 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. However, a workpiece treated in this way can then no longer be cut without destruction, as with untreated glass,, as possible.
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