Cyra DuQuella on fri 12 apr 96
I have a glaze recipe that calls for calcium fluoride. I have been told
that what I need is fluorspar. In the catalog from my local clay supplier
there is a warning that this chemical "can be destructive to kiln furniture
after long-term use." I would really appreciate some advice.
TIA
Cyra
Linda Arbuckle on mon 3 jan 00
Fluorspar:
Calcium fluoride. Fluorine burns off in firing, may cause boiling and
pin- holing over 5%. Fluid melts at low temps. May cause unusual blues
w/Co and Cu. According to Ceramic Industry: "During firing fluorspar in
contact w/silica and clay is thought to dissociate into gaseous SiF4.
The volatile fluoride may in time promote destruction of kiln
refractories."
Also read info via ClayArt of the gas etching studio glass windows so
that they appear frosty over time.
Linda
--
Linda Arbuckle, Assoc. Prof.
Univ of FL
School of Art and Art History
P.O. Box 115801, Gainesville, FL 32611-5801
(352) 392-0201 x 219
e-mail: arbuck@ufl.edu
Gail Phillips on wed 6 oct 04
Hi, All -
Going through my chemicals, and have discovered a 100-lb. bag of =
Fluorspar,
unopened. $35 + shipping takes it, or you can come and pick it up in
Indianapolis. Good fluxing agent for low-fire.
"Sanity calms, but madness is more interesting." - John Russell=A0
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