Glass that comes out of the
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June 24, 2010 at 7:02 pm #11656
Glass that comes out of the kiln unbroken – but breaks later – does so for one of two reasons: compatibility issues or inusufficient annealing.
The pieces you describe – irregular shaped (i.e. gaps ing glass) and with metal inclusions are going to make annealing tougher. Also, metal inclusions can cause compatibility issues.
If you aren’t changing your designs, your kiln might be shifting temps. Can you post a picture of the fractures?
Helios Kiln Glass Studio