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Boro Room -- For Boro-related tips, techniques, and questions. |
2014-04-17, 11:06am
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Junior Member
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Join Date: Oct 01, 2013
Posts: 3
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Melting boro in the kiln
hi i was wondering does anyone know if i can purchase molds and melt my boro coe 33 glass in them in the kilns?
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2014-04-17, 11:25am
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Senior Member
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Join Date: Nov 06, 2005
Location: Austin - Texas
Posts: 2,708
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I have only managed to melt boro in the kiln once, and that was when my relays failed and the kiln went to max heat and stayed there for 18 hours. Even then, it didn't really melt all that much. It slumped more than it melted, and the colors were awful after it did. Maybe you need a extra heavy duty kiln to do it?
__________________
Eric
The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. ---- Albert Einstein
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2014-04-17, 1:00pm
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Alaska Boro
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Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
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From a Google search....
"For the kind of flow you need the glass well past the liquidous stage and in full melt mode. From batch you'd need probably in excess of 3600, and from cullet probably at least 3000.
Also, phase separation and devitrification are serious problems with boro, MUCH more so than with soft glasses, so work hot, work fast, cool fast, and then anneal, don't let the glass sit at one temp too long.
2200 is good 2300 is better. pouring and fusing boro should be maybe 3000 but that is really hot boro and you have to have some excellent elements to be doing that."
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2014-04-17, 4:03pm
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Now part of the Dark Side
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Join Date: Jul 02, 2010
Location: North Central PA
Posts: 966
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I've melted boro in the kiln however, it was pure accident.
__________________
Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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2014-04-17, 9:32pm
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Borovangelist
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Join Date: Jan 26, 2007
Location: Auburn, MA
Posts: 3,002
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It's possible to fuse boro, the bigger problem is trying to control devitrification.
You'll need something a little beefier than the standard annealer though.
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-Tom
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