2009-11-19, 2:06pm
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I'm a lilac!
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Join Date: Jun 09, 2005
Location: Portland, Oregon
Posts: 8,793
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Quote:
Originally Posted by likes to make glass stuff
From Bullseye's site:
"Certain glasses – reds, yellows and oranges in particular – have a tendency to shift their internal chemistry when fired for extended times, more than once, or to temperatures higher than a typical full fuse (1450 – 1500F). They may, under these conditions, become incompatible. With these glasses, the test is therefore performed (on the same chip) three times."
http://www.bullseyeglass.com/weblog/...se-of-the-fun/
I'd think we could use the temperature range as a cause for incompatibility, since they do. It's my understanding that flowing glass is in that range.
I'm not saying I go for the cool glass working prevents cracking theory, as I haven't experienced it, but if BE says it, doesn't it make it a possibility?
And they say over and over again that COE and compatibility aren't as simple as matching the numbers.
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That is a caution for people doing multiple, extended or high kiln firings of the same piece repeatedly. It has never been an issue with flameworked BE.
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-Kalera
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