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I recently learned, to my surprise, that glacial acetic acid is flammable.
The article on reducing stress is very interesting, but it deals with faceplate removal from the bell by melting the frit which involves much higher temperatures.
I suspect that the problem with the heat method isn't thermal stress, but that the PVA or other material has plasticizers in it. With PVA it's probably water. When you heat it the plasticizer becomes a gas and when trapped makes a high pressure between the cover glass and the face of the tube.
I seem to remember in an earlier cataract removal thread someone saying that bubbles would form as they used the heatgun.
John
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