HAUKSBEE Posted June 6, 2010 Report Share Posted June 6, 2010 I threw eight or so porcelain bowls the other day. Two of them developed cracks in the lower part. I wondered: why just two out of the eight? The clay was wedged up at the same time. The cracks look rather like S-cracks that occasionally happen at the bottom of vessels. But I've never seen them this high. Any thoughts on what causes this? Link to comment Share on other sites More sharing options...
Matt Katz Posted June 7, 2010 Report Share Posted June 7, 2010 I threw eight or so porcelain bowls the other day. Two of them developed cracks in the lower part. I wondered: why just two out of the eight? The clay was wedged up at the same time. The cracks look rather like S-cracks that occasionally happen at the bottom of vessels. But I've never seen them this high. Any thoughts on what causes this? All cracking is caused by inconsistencies in drying, but the failure itself is most likely occurs at a point of inconsistent mixing in the body. All failures are caused by poor mixing, poor composition or both. Link to comment Share on other sites More sharing options...
HAUKSBEE Posted June 7, 2010 Author Report Share Posted June 7, 2010 All cracking is caused by inconsistencies in drying, but the failure itself is most likely occurs at a point of inconsistent mixing in the body. All failures are caused by poor mixing, poor composition or both. OK. Admittedly, the wall above, and the floor below, were thinner and the area of cracks didn't get trimmed down as much as I would wish. Just thought I'd ask since I'd never seen cracking like that before. Thanks much. Link to comment Share on other sites More sharing options...
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