3% and 2% Zircopax added to G2926B cone 6 clear. Why?

Sunday 13th August 2017

If you are interested in the most insight-live.com/glossary/210">functional possible surface, consider a 2% zircon addition to your transparent glaze recipe (the outside glaze on these mugs is a copper blue, but that is not the one we are interested in). The clear glaze on the insides of these two identical cone 6 porcelain mugs has 3% and 2% zircon added. It is not being added to opacify, it is being added to toughen the surface and reduce the thermal expansion. The presence of the 2% zircon has not affected the gloss or transparency of the glaze on the right. However, the 3% on the left has opacified it just slightly and made the surface a little silky. So that is too much for this glaze (although it might be OK if the melt fluidity was higher).

Pages that reference this post in the Digitalfire Reference Library:

Zircon, Zircopax, G2926B - Cone 6 Whiteware/Porcelain transparent glaze, Glaze Durability

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