Why is this crystalline glaze not crazed? Even in the pool at the bottom?

Monday 8th June 2015

Because this is Plainsman Crystal Ice, it contains 40% silica (quartz). It also does not vitrify, so as much of the quartz remains undissolved as possible. This produces a body with a much high thermal expansion so it can put more of a squeeze on the high-expansion glazes used in the crystal glazing process (it is very common for such glazes to be crazed, it is accepted as part of the process).

Pages that reference this post in the Digitalfire Reference Database:

Crystalline glazes, Calculated Thermal Expansion

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