The same liner glaze crazes on the porcelain but not the stoneware

Tuesday 23rd August 2016

The insight-live.com/glossary/85">stoneware is made from sedimentary clays mined in a in southwestern Saskatchewan quarry, they have a higher quartz grain content and enough natural feldspar to produce functional density (the practical porosity is about 2.5%). The porcelain on the right is a 45:35:20 kaolin:feldspar:silica blend (there is enough feldspar for about 0.5% porosity). The stoneware has more quartz particles to impose their high thermal expansion because fewer are taken into solution by the feldspar. That means that the body has a whole can put the squeeze on the glaze to prevent it from crazing.

Pages that reference this post in the Digitalfire Reference Library:

Quartz, Glaze Crazing

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