Jump to content

Shrinkage


Susie

Recommended Posts

Okay, a newbie question - when a clay body is listed as having 11% shrinkage, does it shrink 11% in the bisque AND the cone 6 firing or is that the total shrinkage after both firings? Is absorption rate important? Thanks!

 

 

 

It is impossible to know without confirming with the source of the data.

Absorption is very important.

Ideally you want absorption as close to 0.5% as possible (basically within the margin of error of 0%)

Link to post
Share on other sites

The data is from the Highwater Clay specification on their Little Loafers...at cone 6....11% shrinkage...1.87 absorption. I'm not trying to get overly technical, just trying to figure out how big to make something so it will be the size I want after its fired. Have a few tiny mugs in my collection. tongue.gif

 

thanks for the help!

Link to post
Share on other sites

You have a couple of options. One is a shrink ruler available at many pottery supply stores that is calibrated to different clay shrinkage rates (8%, 10%, 12% and 14%).

 

Or. use the shrinkage rate to calculate the size. A six inch tall cylinder at 11% shrinkage would need to start out about 6.7" tall (6" x 1.11 = 6.67).

 

Or. 11% of 6" = .66"; 6" + .66" = 6.7"

Link to post
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.