demeter Posted December 16, 2018 Report Share Posted December 16, 2018 When I belonged to a studio I had NO problems with this clay bloating. For the past year I have been firing in a home studio. I started out with an old paragon kiln with a kiln sitter and now have a used skutt 818. I have been mixing my own glazes and most of my other pieces have turned out fine. I bisque fire at 04 with the lid propped half an inch (until 1000 degrees) and top peed out. I glaze fire with the same method have tried programmed cone 5 and cone 4 and still have bloating in the black clay. How can I fix this? Link to comment Share on other sites More sharing options...
glazenerd Posted December 16, 2018 Report Share Posted December 16, 2018 Hi Dem: Welcome to the forums. On page 2 there is a section on firing red and dark bodied clays. Tom Link to comment Share on other sites More sharing options...
liambesaw Posted December 16, 2018 Report Share Posted December 16, 2018 Have to fire very slow from 1200-1700, the article linked above recommends 108f per hour Link to comment Share on other sites More sharing options...
neilestrick Posted December 16, 2018 Report Share Posted December 16, 2018 If your kiln is digital, do not prop the lid. The top peep will handle the venting, and the controller can get angry about the heat loss with the lid propped. If you've got a downdraft vent, keep all the peeps closed. Have you verified the temp with cones on the shelf? Link to comment Share on other sites More sharing options...
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