Fusing Glass Catalogue Final - Flipbook - Page 29
Wissmach Glass Firing Suggestions
Enjoy this little e-book provided by Petra Kaiser and good luck with writing your own firing schedules from
now on
That’s only going to happen when all your glass pieces have the same size, shape and color. Never have firing
schedules been so slow and hold times so long and when I ask people why, the typical answer is, somebody gave it
to me, and it works. After 2 incidents where people reported the Wissmach white glass cracking after firing I
decided to talk to you about firing schedules and their consequences. First, I tested the glass in question to see if
there is any stress between the white and the clear. And each test so far has shown absolutely no stress. Then I
tried to copy the piece and see if it would crack. But so far so good - I could not get the glass to crack.
I suspected the difference in firing would be the issue and so I went back to books on glass fusing including my own,
wondering if I could find a scientific explanation for all my theories when studying those schedules. After several
days of research, I think I found the scientific explanations I was looking for.
Sample of a Full fuse schedule that resulted in a
stress related crack after firing.
