Thread: Blue Sulphur
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Old 08-11-2019, 02:37 PM
Bradley Howes Bradley Howes is offline
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A borate glass, as I understand it, is a single component glass that is made up of B2O3. It melts into a vitreous soup at 450C (842F). Strangely, it has a coordination of 3, that means for every boron atom, it is bonded to 3 oxygens.
I've used boric acid as a flux to purify some gold. The gold formed a bead at the bottom of the crucible and the glass above it dissolved most everything that wasn't gold. When this glass is poured out of the crucible, it starts off perfectly clear and transparent but within an hour, the surface becomes cloudy because it absorbed water from the air. For any glassblower that primarily uses silica as their glass former, borate glasses aren't compatible in any way.
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