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Boro Room -- For Boro-related tips, techniques, and questions.

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  #1  
Old 2011-11-13, 7:33pm
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kokeshikitten kokeshikitten is offline
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Question Borosilicate for rondels?

I was wondering if anyone here made boro rondels for stained glass applications. Is boro glass strong enough to be put in a stained glass panel? If you fume them with silver, will that finish erode from the elements? Thanks a bunch!
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Old 2011-11-13, 8:14pm
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How do you mean, "strong enough"?

As for the fuming, it's a surface application, so it can eventually rub off and oxidize if not sealed.
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Old 2011-11-13, 8:15pm
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I dont see why it couldnt be used. boro is stronger then soda lime glass...which is what is normally used in stained glass.

as to fuming silver will stay better then gold fuming know that...but you might encase it in clear just in case.
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Old 2011-11-13, 8:17pm
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As in, strong enough to support it's own weight and the weight of other glass in lead channels.
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Old 2011-11-13, 8:19pm
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Oh yeah, by fuming, I mean the effect that makes the glass look caramel/yellow...not the metallic, shiny type.
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Old 2011-11-13, 10:34pm
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You could try encasing it to protect the silver fume.

I don't recall the why's, but I seem to recall seeing Aussie (Chris Arnold) mentioning that boro is actually more brittle than "soft glass" It's just more thermally resistant than the other glasses.

Keep in mind, all those windows that lasted the ages were spun out soft glass (probably COE 60-80 range like float) and stained glass which cracks if you look at it funny. So boro's likely up to the task from a compression standpoint, but if you're going to make something big enough that you have worry about the weight, and given it's all going to be leaded together anyway, you may as well go with the tried and true.

If you had to do actual glass to glass fusing, then maybe you might worry about it, but if you're leading in between panels, COE's a moot point.
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Old 2011-11-14, 6:30am
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Yes and yes... boro will hold up just fine...
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