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Avoiding bubbles when fusing

Posted: Mon Dec 08, 2003 8:50 pm
by GAM
:roll:
I'm using Spectrum 96 glass, two layers or 1/4" plus small detail in an overall 14" diameter round. I understand to avoid bubbles, it helps to do a "ramp freeze" so I went 60 dpr to 1300 then 4000 dph to 1480, then 1200 dph to 1000, 300 to 955555 and finally 200 to 800 and off. I STILL had one large
bubble that opened.

Any ideas of how I might avoid that?

Posted: Mon Dec 08, 2003 8:59 pm
by charlie
those look like really odd temps. did you have a bunch of typos?

try something like this:

300/1150/20
50/1250/0
400/1480/15
anneal

your anneal temp of 955 sounds wrong too. look on the spectrum site for a chart for typical ramps/temps.

Posted: Tue Dec 09, 2003 12:58 am
by quill
The annealing temp is okay. Spectrum says 955 (+/- 10)