The Goodsons on mon 19 mar 07
Hello, ClayArt/ers!
/Wow, NCECA looked great. I have a question that I hope one of you can
answer. I just got a new electric kiln, and it has the electronic
controller :-) - the booklet gives directions for firing to slump
glass. Someone once told me that slumping glass could somehow be hard
on a pottery kiln. Is that true? I hope not. I really want to try it out.
Thanks,
Linda Goodson
Lincolnton, NC
Arnold Howard on wed 21 mar 07
From: "The Goodsons"
Someone once told me that slumping glass could somehow be
hard
> on a pottery kiln. Is that true?
Linda, most glass projects are easy on a pottery kiln. This
is because glass is fused and slumped at low temperatures
(1300 - 1500 degrees F). The Type-K thermocouple lasts a
long time in that temperature range.
However, very slow heating and cooling rates for thick glass
pieces are hard on the mechanical relays. Some of the
cooling segments take three days of frequent cycling.
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
Linda Goodson on wed 21 mar 07
Dear Arnold Howard,
Good day to you. Thank you for your kind explanation. The project that I
am curious to try is the first kind that you described:
"Linda, most glass projects are easy on a pottery kiln. This
is because glass is fused and slumped at low temperatures
(1300 - 1500 degrees F). The Type-K thermocouple lasts a
long time in that temperature range."
However, very slow heating and cooling rates for thick glass pieces are hard
on the mechanical relays. Some of the cooling segments take three days of
frequent cycling."
Now I feel safe in trying to slump a thin piece of glass. I appreciate the
help.
Good Evening,
Linda Goodson
208 East Rhodes Street
Lincolnton, NC
Arnold Howard on thu 22 mar 07
From: "Linda Goodson"
> Now I feel safe in trying to slump a thin piece of glass.
You will need to coat the mold with kiln wash or glass
separator. Any area of the mold that would form an air
pocket when the glass slumps will need a small hole for the
air to escape.
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
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