Why wouldn't there be glass with different COE's seems to be a better question. Yes, they have different working characteristics, and lampwork is a tiny segment of the glass world - there is industrial, scientific, decorative, household, fusing, casting, commercial, etc. etc., and a lot of it can be used to make beads. The subject is complex, too much so to really cover in a forum post. There is a ton of literature to explain it out there, technical, academic and art based, if you want to really pursue an answer.
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Kathy
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