Convergent Series

learning, using & teaching metal clay, and other aspects of life

A very quick shrinkage comparison of Hadar’s “One Fire Trio”

Posted by C Scheftic on 2014/01/25

Here’s a photo showing a few more little bits from my first trial firing of Hadar’s One-Fire Trio. Though I didn’t start out by making them as perfectly-similar as would be required for a scientific comparison, I did roll and cut them to the same size. So, in order, from the most shrinkage to the least are: Champagne Bronze (C), Low Shrinkage Steel XT (L), and Friendly Copper (F).

I’ll have to see if the apparent ratios continue to hold with other cubes. (That is, some differences could just be due to my having mixed more or less water into the different products. And I just stamped the letters in by hand, which could have changed the shapes a bit too.) But, with the other pieces I fired at the same time, the ratios do seem to vary depending on the shape of the piece being fired. I don’t have enough data yet to be sure, and these cubes are the only items where I made three matching pieces to start with.

But I will say that, while the Champagne Bronze cube did shrink somewhere around the proposed 30% rate all around (per the Cheat Sheet for Hadar’s Quick-fire Clays on her blog), a ring shank made from the same batch shrank barely 15% in length and a bit less than that in width. (Its height/thickness is just too small for me to accurately measure whether all the remaining shrinkage went into that, or not.)

Still, I figured I’d share the preliminary results. Please add a comment if you try these clays and find results that are either similar or different!

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