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Showing results for tags 'cracking'.
Hello, I was wondering if anyone could help me, I have around 10 glaze fired tiles, they are all stoneware and I fired to 1200 with a 30 minute soak. 7 were glazed with textured brush on glazes and 3 were painted with a transparent glaze. For some reason when I took them all out of the kiln, all three transparent glazed ones and one beige tile appear to have several cracks in the back. The clay is a white stoneware clay, I placed them directly onto a batt washed kiln shelf and all three transparent tiles were on the top shelf. Not sure if this may be a coincidence. Please let me know if anyone has any suggestions as to how I can fix this issue?
I am an experienced potter trying to find the right porcelain for my work. As of late I have been using cone 6 Laguna 15 because it is super white and super vitreous. Both of these things are important to me because I leave much of the exterior of my pots unglazed, so the porcelain needs to look very white and not stain from absorption over time. However this clay cracks like crazy!!! About 50% of the mugs I make have cracks around the handles. Also, lots of cracks along the bottoms. I have tried everything I can think of to prevent cracking- compressing like CRAZY, adding more clay to attachments, different glaze/clay combos, slower firings with holds... at this point I’m wondering if it’s me or if it’s just the clay. Has anyone else had this problem with Laguna 15? Has anyone found alternative super white, vitreous clays that don’t have cracking problems? This clay is so beautiful I wish I could figure this problem out, but a 50% loss rate is too high!
Hi everyone, Quick question: we use calcite alumina, or alumina calcined (in South Africa) under ware when glaze firing to provide a surface allowing movement to avoid cracking, what name does the rest of the world use? TIA Andrea