clay lover Posted May 6, 2015 Report Share Posted May 6, 2015 I made a GREAT find this AM. a big plastic thing with exactly the size , angles and shape I have been wanting for slumping a basic form for what I want to make. BUT. it is 2" wider that my kiln. If my clay's total shrinkage is 12%, how much of that will be in the drying, how much in the bisque fire? I want this to end up just big enough to get in the kiln without touching any elements to bisque fire it. I know after the bisque it will be good to go for glaze firing . Can't wait to start on this! DRAT, can someone correct the title? Link to comment Share on other sites More sharing options...
David Woodin Posted May 6, 2015 Report Share Posted May 6, 2015 My clay has 5% shrinkage on drying and another 5% on bisque the remainder on glaze firing. David Link to comment Share on other sites More sharing options...
Pieter Mostert Posted May 7, 2015 Report Share Posted May 7, 2015 The dry-to-fired shrinkage of the clay bodies I use range from 1.1% for a white earthenware to 8.8% for a dark red earthenware, both fired to cone 4. I've only worked out the wet-to-dry shrinkage for a few clay bodies, and have shrinkage rates of between 4.5% and 7.2%, but obviously this depends on how wet the clay is to begin with. You could easily work out the wet-to-dry shrinkage rate yourself by making a small bar of clay and comparing the length before and after it dries. Link to comment Share on other sites More sharing options...
clay lover Posted May 7, 2015 Author Report Share Posted May 7, 2015 good point, Peter, I will do that today. so simple, why didn't I think if it? Link to comment Share on other sites More sharing options...
Marcia Selsor Posted May 7, 2015 Report Share Posted May 7, 2015 It really depends on the clay. But my raku clay shrinks 5% from wet to bisque. My porcelain shrinks about that same from wet to bisque and another 6-7% to the higher temps. like ^6 or ^9 depending . Total for porcelain that I use is 11-12% Link to comment Share on other sites More sharing options...
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