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I'd love to know what the annealing bubble stuff actually "is". I've requested samples of aerogels from a manufacturer just to play with but according to the MSDS and tech literature, it doesn't have a high enough temperature range. It tops out around 750F. I'm still going to plunge a hot bead into it (in a safe environment) and if it ignites, we'll put it out, it not, I want to see how the bead comes out aesthetically.
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I asked my people in Japan if I could get a MSDS for the Annealing Bubbles. I was told that while they could request one from the manufacturer, it would be in Japanese. Alas, I don't read Japanese.
I was told, though, that the material is 100% silica. Thus, it should be able to tolerate high temperatures easily.
Clearly, one would not want to breath it, but fortunately, it in not very dusty.
HTH
Malcolm