Grog does not always have the intended effect

Thursday 19th September 2013

These DFAC test disks (drying performance) show that minor additions of grog do not reduce the insight-live.com/glossary/150">fired shrinkage of this medium fire stoneware much. Nor do they improve its drying performance. Even at 20% grog, although the addition has reduced drying shrinkage and narrowed the crack somewhat, it is still there and even resembles the zero-grog version. A possible reason is that this body is coarse-particled, having a relatively small total particle surface area. The addition of the grog has significantly increased the total area.

Pages that reference this post in the Digitalfire Reference Library:

Grog, DFAC Drying Factor, Drying Performance, Grog, Drying Shrinkage

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