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I've worked with glass & clay for many years. I think you may have more success if you fire your cone 10 clay to cone 10. The clay is not fully vitrified and quite weak if only fired to an 04 bisque.
Sorry about the typos. My app is not allowing me to see what I've typed until I post it! When I tried using wire only, to secure the mild, there was excessive stress in at those points of contact && the mild would crack from the pressure of blowing. With a refractory blanket wrapped in wire, pressure was more evenly spread over the surface of the mild and they did not crack. I love what you're doing & cantvwaitvto see more!
Another good reason to fire your clay to its glaze firing temp is that there is still quite a lot of shrinkage that happens between bisque & gfinal firing temps. With the difference COE between glass and ceramic, it's worth considering. Porcelain, though fragile, shrinks very little once it's at its mature firing temp. At the same time, porcelain can be 'fluid' at max temp, aka it can move & slump quite a lot.Good Luck! I will keep watching!
I have blown into Mold Mix molds and found that wrapping the mild/clay in a non- friable refractory blanket and then tying with wire worked best. We hen I used wire only, the s