Okay, the freeze boil test is a simple that that can be performed by almost everyone, with no special tools, but it does not yield a quantitative result. Drawing on my experience as an industrial QA technician/engineer, wouldn't a better test be to place one of the afore mentioned clear beads into a bench press with a calibrated strain gauge, and then see how much force (pressure) the clear bead can withstand before failure? Just thinking out loud here.
ETA: Okay, I've probably way over thought this, way beyond what Mike originally asked.
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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