I have glazed a few pots with a glaze made of 50/50 ash and ball clay. The clay is warping round bowls into tacos (both stoneware and porcelain, made by me and by someone else). I guess this is a fit issue, right? Is there something I should consider adding to rectify the issue? I should add that I know very little about glaze chemistry.
Glaze Warping Pots
Posted 11 November 2013 - 05:44 PM
Not necessarily the glazes fault. Are you glazing both inside and outside of the bowls? What cone, what clay, what firing profile, etc? We need a lot more info.
Kiln Repair Tech
Owner, Neil Estrick Gallery, LLC
Posted 11 November 2013 - 08:30 PM
Posted 11 November 2013 - 10:05 PM
Are these bowls placed on the outside of the load or inside?-are they flame licked or not?
The glaze fit is just one of many issues that may contribute to your tacos-how thin are they taco shell or thicker?
Posted 11 November 2013 - 11:32 PM
Posted 12 November 2013 - 05:33 PM
I use a 50/50 Pear wood ash and Ball Clay glaze without any problems, it's always been on basic, cheap, buff firing stoneware, fired to 1260°C in a gas kiln. (I allow 10 -11% for shrinkage with that clay if I ever need to calculate it for a project).
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