720C is right in the middle
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September 12, 2011 at 10:53 pm #12204
Stephen RichardParticipant
720C is right in the middle of the devitrification zone, so soaking for 30 minutes there is not a good idea. Try a long soak at ca. 677C or a quick one at 760C. But the main thing is to have every thing very clean. Contaminated surfaces, even if only a little, on bottles and float glass lead to devit very easily.
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/
