Annealing
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May 30, 2011 at 8:55 pm #12079
Stephen RichardParticipant
From your description and the fact that you don’t mention annealing, I am betting on inadequate annealing. Annealing consists of two stages – first a soak at the annealing temperature for a length of time adequate to equalise the temperature throughout the glass, second – a slow steady cool down to about 370C (for 6mm, 80C/hr should be adequate).
If the piece has not been adequately annealed, it will break easily upon the heat up.
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/
