The Allens on fri 4 apr 97
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I have a glaze formula calling for =22kaopaque=22. It doesn't appear in any=
of the
books that I have. Does anyone know what it is and where I might order it?
Thanks.
Carla Allen
ridgerun=40scrtc.blue.net
Craig Martell on mon 7 apr 97
At 08:14 AM 4/4/97 EST, you wrote:
>----------------------------Original message----------------------------
>-------------------
>I have a glaze formula calling for "kaopaque". It doesn't appear in any of the
>books that I have. Does anyone know what it is and where I might order it?
>
>Thanks.
>
>Carla Allen
>ridgerun@scrtc.blue.net
Hi Carla: The material is most likely Kaopaque 20 which is a very white non
plastic Kaolin mined and processed by Georgia Kaolin. I think though that
Georgia Kaolin was purchased by English China Clays and Georgia retained
control of the 6-tile and kaopaque depoits under the name of Dry Branch
Kaolin Co., Dry Branch, Georgia. Check with your local suppliers, most of
them carry Kaopaque.
Regards, Craig Martell-Oregon
Brooks Burgess on mon 7 apr 97
At 08:14 AM 4/4/97 EST, you wrote:
>----------------------------Original message----------------------------
>-------------------
>I have a glaze formula calling for "kaopaque". It doesn't appear in any of the
>books that I have. Does anyone know what it is and where I might order it?
>
>Thanks.
>
>Carla Allen
>ridgerun@scrtc.blue.net
>
>Its been quite a few yerars since I've heard anyone mention kaopaque but if
memory serves me it is a "delaminated " kaolin product. I think it is mined
(or produced) by the same folks here in Georgia that supply T-6 kaolin and
if so I would guess that Kickwheel pottery supply in Atlanta ,Ga. should be
able to supply it or tell you where to order it(assuming it it still
available). Hope this helps. Brooks Burgess
Tony Hansen on mon 7 apr 97
> I have a glaze formula calling for "kaopaque". It doesn't appear in any of th
> books that I have. Does anyone know what it is and where I might order it?
MATERIAL: KAOPAQUE 20 KAOLIN - WHITE NON PLASTIC DELAMINATED
KAOLIN
SUPPLIER: GEORGIA KAOLIN
RAW WEIGHT: 253.14
CaO....... 0.21% 0.01
K2O....... 0.08% 0.00
MgO....... 0.03% 0.00
Na2O...... 0.03% 0.00
TiO2...... 0.66% 0.02
Al2O3..... 39.30% [ 1.00]
SiO2...... 45.20% 1.95
Fe2O3..... 0.32% 0.01
LOI....... 12.00%
======
97.83
An extremely white firing delaminated kaolin of very low plasticity.
It is
highly refined from Geogia deposits and is very useful in casting
bodies.
Its low plasticity makes it difficult to produce workable plastic
porcelains if used in significant amounts. Unlike many American
kaolins,
kaopaque tends to produce a porcelain of pleasing blue-white
coloration
(rather than yellowish white). Unlike British materials it is quite
refractory and porcelains employing it will require more feldspar.
We use this material as an important ingredient in translucent doll
porcelain
at cone 6. I've made near-bone-china looking bowls using this in a
casting body
and adding a minute amount of blue stain to the clear overglaze to
emphasize the
blue-white character.
I can't see why this would be useful in a glaze. Normally kaolin serves
a dual
purpose of supplying alumina and acting as a suspender. This will do the
former
but not very well the latter. I'd use EPK instead, it'll suspend and
gel.
--
=================================================================
Tony Hansen, Plainsman Clays
Jim Karavias on sat 19 apr 97
Hi All,
I'm posting this on behalf of a friend that hasn't internet access.
She would like to know if there is a substitute for Kaopaque (sp?)
that might be more economical. She would also like to know what one
might mean when they describe kaopaque as "self-laminating". Any
pointers would be helpful.
Thanks...
Jim Karavias
jpk@enter.net
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