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Temperature: 550C - 600C
NotesThis term refers to an abrupt 2% change in volume that occurs in quartz crystals when they are heated from the room temperature stable alpha phase to the beta crystal phase that exists about 573C. It is referred to as an inversion because the process is reversed when the temperature falls back below 573C. Since the change occurs suddenly ware will crack if there are significant temperature differences across its cross section. For example, if one side of a piece is at 573 and the other at 600 at point A on a cooling curve, then as the piece cools the volume change will move horizontally across it and obviously start a crack at the first weakness it finds. In a way, quartz inversion can be beneficial because it can put the glaze under compression and thus prevent crazing.Out Bound Links
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