timothy knick on tue 20 feb 07
I'm not sure if it means glass pools can be made without crazing, but my
book says glass needs to be "annealed". Or in other words it means it needs
to be slowly cooled through the specific "annealing range" of that type of
glass. For a typical soda-lime-silica glass (a beer bottle) this range is
between 1020 F and 900 F, my book says. It also seems to read that thicker
glass will need more time in this range. How long? I don't know. I am
planning on playing around with this, so I will report back my findings.
Glass paperweights that explode years after they are made were not properly
annealed.
Tim
Reference: Dictionary of Glass, materials and techniques, second addition
author Charles Bray
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Arnold Howard on thu 22 feb 07
From: "timothy knick"
my
> book says glass needs to be "annealed". Or in other words
> it means it needs
> to be slowly cooled through the specific "annealing range"
> of that type of
> glass.
Another cause of glass crazing is incompatibility between
the glass and the clay. If the coefficient of expansion is
off even a little, the glass will craze. This also applies
to different types of glass fired together.
An excellent resource on this topic is the bulletin board at
www.warmglass.com .
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
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