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slumping temp for float glass
Posted: Fri Jan 16, 2004 3:30 pm
by Linda Hassur
I tried to slump a very small bowl yesterday along with a couple more molds that I was using to slump. The other two completed their slumping (one with BE clear and the other float) but the small bowl never did hit the bottom of the mold. I started at 1250 and continued rising the temp in small increments until I hit 1325. I decided at this point that it wasn't going to totally slump. Any ideas? Thanks Linda
Posted: Fri Jan 16, 2004 3:35 pm
by charlie
the smaller in diameter it is, the longer and higher you have to go. you need a certain amount of weight of unsupported glass in the middle to make it bend. the less this is, the more heat and/or time you have to provide.
Posted: Fri Jan 16, 2004 3:49 pm
by Judy Schnabel
Linda,
Personally, I would not try to slump float and BE or Spectrum in the same firing. It takes higher temperatures to slump float than BE or Spectrum.
Was the slump that didn't quite make it float?
Judy
Posted: Fri Jan 16, 2004 5:55 pm
by Linda Hassur
yes, it was the float that didn't slump enough. How high do you usually have to go to get float to slump into a small mold? Thanks Linda
Posted: Fri Jan 16, 2004 7:01 pm
by Judy Schnabel
Linda,
I'm not looking at my records at the moment, but I slump Spectrum around 1100 and when I do a drop mold with float I fire to over 1400. If I were slumping float into a more shallow mold, I'd go to about 1200 or so.
Judy
Posted: Fri Jan 16, 2004 7:11 pm
by Bert Weiss
I'd probably go to 1300 - 1350 depending on how fast I wanted it to happen.