Somewhere back in my brain I remember that glass can change in successive firings. Especially the red, orange and yellow. Since I usually full fuse at around 1410° F (765° C) and often full fuse and slump in one firing, I did not encounter those issues.
But as Wissmach’s kiln glass consultant I have spoken to people with various fusing questions. In most cases we were able to solve the issues by changing their firing schedule. Therefor I sat down and wrote a Firing E-Book.
Recently I did get some 90 COE glass (not Wissmach) to test. So at first I fired it at 1410° F (765° C) and placed it between the polarized film on our Fuse It Test Card. The results were very good. No stress at all. The transparent dark red was still transparent and did not show any stress. The opaque orange of course was still opaque and also did not show any stress and the yellow transparent was equally perfect.
In a second test I took the same test glass piece and fired it again at a higher temperature; 1460° F (794° C). The orange and the yellow stayed the same. No stress and no change of transparency. But we could see a lot of change in the dark red. It turned opaque and is now showing a lot of stress
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Petra:
I have had little luck in firing Wissmach 90 COE glass.
I purchase the 12″ circles and in most cases they broke during the firings either full fusing or slumping.
Have you checked the firing e-book? We fire Wissmach Glass every day without any issues. Which glass did you use with the circles?
Hallo Petra und Wolfgang,
ich habe gerade wieder Glasbilder von Marc Chagall gesehen. Er wäre sicher von der Fuse-Technik begeistert. Ich frage mich, wie seine Glasfenster ausähe, wenn das Glas bebrannt würde. Vielleicht könntet ihr mal einen Versuch machen (natürlich nicht mit den Originalen).
Viele Grüße
werner und erika.
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