What is a bubble squeeze?
The term bubble squeeze
refers to the process of allowing the glass to relax gradually allowing the air
to escape to the edge of the piece.
The exact temperature is
dependent on the softening point of the glass, its weight, and the complexity
of the layup. Normally the bubble squeeze is performed with a soak of
about 30 minutes at the slumping temperature.
Of course, glass being glass,
the slumping point of any glass is a range temperatures. This can be
taken advantage of for complex layups or potentially difficult projects.
Pick the temperature about 50°C below the standard slumping point. For
example, Bullseye recommend 677°C as the slumping point. Programme a slow
rise - say 50°C per hour - from 625°C to 677°C where you also soak for at least
30 minutes. This slow rise allows an even more gradual and progressive
relaxation of the upper glass toward the lower.
For more information look at this post.
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