http://www.colorthenet.com/2006/05/06/glass-fusing/
fusing schedule for stained glass? Bluemoon?
If I cut 1 inch squares and stack 3 peices high of regular stained glass that is used by stained glass artists – and NOT so much fusing artists – what kind of schedule should I use??
First of all you have to make sure that the glass is compatible if you are using different colors for the pieces, if not they well break apart. Which is why Bullseye and Spectrum are tested compatible.
With pieces this small you should be able to heat to 1000F in about half an hour without shattering the glass from too rapid heating. You will then want to raise it to above 1250F to the soaking temperature fairly quickly. The problem with using non-standard glass is that you will have to judge the result you want and make records of the results. Depending on how high you go you will get a bare fuse with no melting of the corners, a solid fuse with rounding, or what is called flat fuse with considerable rounding (this refers to small pieces on larger pieces which melt flat into the larger piece)
As soon as the piece has reached the fuse you want, you open the lid and drop the temp below 1000F to avoid devitrification. A soak of about half an hour near 1000F is followed by a ramping cool cycle of about 3 hours for the 3/8″ thickness that you are talking about.
As you can see, there is nothing automatic about the cycle, you have to observe the progess at the high end and keep a log of temps and results so you can do it again or modify it.
Fusing and Slumping Glass
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