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Glass Compatibility?
Posted: Sun Apr 27, 2003 7:55 pm
by GlassOrchid
This is a hot glass question but does overlap a little.... the local high school has a glass blowing program and the teacher stopped by to ask if I can help them get some glass as they ran out of glass and money <smile>. He said that is doesn't matter what the COE is as he melts it all together in the crucible and then just uses it. I have no experience with glass blowing but this sort of alarmed me as it goes against what I've been taught and read. Is it really not a problem to mix any old glass together like this????
~Nancy
C.onfused O.n E.xpansion
Posted: Sun Apr 27, 2003 9:46 pm
by Marty
He's just making a new glass of unknown COE. No problem (like fusing an unknown with itself) unless he wants to add color.
Re: Glass Compatibility?
Posted: Mon Apr 28, 2003 3:56 am
by Brian and Jenny Blanthorn
GlassOrchid wrote:This is a hot glass question but does overlap a little.... the local high school has a glass blowing program and the teacher stopped by to ask if I can help them get some glass as they ran out of glass and money <smile>. He said that is doesn't matter what the COE is as he melts it all together in the crucible and then just uses it. I have no experience with glass blowing but this sort of alarmed me as it goes against what I've been taught and read. Is it really not a problem to mix any old glass together like this????
~Nancy
C.onfused O.n E.xpansion
He could also add a very small % of oxides
Lots more on this over craftweb
But this may well eat in2 his pot
Posted: Mon Apr 28, 2003 4:41 am
by Kitty
mixing different kinds together in a crucible is sort of like homogenizing it, and the resulting COE is the average of the component types. it works for blowing, but that's about it.
Posted: Tue Apr 29, 2003 10:40 am
by Lani McGregor
Kitty wrote:mixing different kinds together in a crucible is sort of like homogenizing it, and the resulting COE is the average of the component types. it works for blowing, but that's about it.
If it were only that simple. Depending on how hot and how long it's melted, it could be lower than the average... or even lower than the lower COE.
If it's not adequately stirred during melting it could also be cordy.
The smaller the melt, the harder it is to get it homogeneous.
Lani