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When Does The Most % Of Total Shrinkage Of Caly Happen?


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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?

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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.

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