Kevorto on tue 30 apr 02
Looking for help with mixing up a translucent porcelain body
using kaopaque and tile #6. I've got a pallet of kaopaque and
if I need to, I'll start testing away till I get it right. But first I
figured I'd ask if someone had sucessfully done this. Any help or recipe
would be appreciated.
To start with I'm figuring on using a basic porcelain recipe with grolleg
and tile 6 and just swapping out the grolleg with kaopaque.
Materials indexs keep refering to Kaopaque as a delaminated and highly
processed or specially processed material but I haven't been able to find
an explanation of what exactly this means???
thanx
John Britt on wed 1 may 02
Kaopaque is made Imerys, owns Kentucky Tennessee clay company. Do a search
on google. Or try this address www.fitzchem.com/mfg_imerys.shtml
I believe it is used a lot in paints. But you can read about it.
John Britt
Penland
Longtin, Jeff on wed 1 may 02
Kev,
Years ago Ceramics Monthly did a story on Dorothy Hafner and published her
^6 porcelain slip body. I mixed it up and found it to work great. Good
color. Not translucent like bone china but still a pretty good porcelain
color.
If I recall it had Kaopaque, #6 Tile, and OM4 (ball clay) for clay and
Silica, Nep Sye and ??? for non clay.
The clay was something like 15% Kao,15% #6, and 20% OM4. The Nep Sye was
30%, the Silica 10%, and the other ingredient I can't remember, sorry!
Maybe someone else on the list can guesstimate the last ingredient? Its a
fairly basic element. Dolomite perhaps?
Sodium Silicate deflocculates this recipe really well. Darvan 811 may be
better, as its designed specifically for porcelain, but it may be harder for
you to locate.
I think I have the recipe somewhere it would just take a few days to find.
Hope this helps.
Take care
Jeff Longtin
-----Original Message-----
From: Kevorto [mailto:glowbawl@NETSCAPE.NET]
Sent: Tuesday, April 30, 2002 9:25 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Kaopaque in a porcelan body
Looking for help with mixing up a translucent porcelain body
using kaopaque and tile #6. I've got a pallet of kaopaque and
if I need to, I'll start testing away till I get it right. But first I
figured I'd ask if someone had sucessfully done this. Any help or recipe
would be appreciated.
To start with I'm figuring on using a basic porcelain recipe with grolleg
and tile 6 and just swapping out the grolleg with kaopaque.
Materials indexs keep refering to Kaopaque as a delaminated and highly
processed or specially processed material but I haven't been able to find
an explanation of what exactly this means???
thanx
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Jim Murphy on wed 1 may 02
Kevorto,
> Looking for help with mixing up a translucent porcelain body
> using kaopaque and tile #6.
Although I haven't tried this myself, I've heard some potters use a 2:1
ratio of #6 Tile Clay to Kaopaque 20 as a Grolleg substitute.
So, if you had a porcelain recipe calling for 3 Kg of Grolleg, you would
substitute 2 Kg #6 Tile Clay and 1 Kg Kaopaque 20.
> Materials indexs keep refering to Kaopaque as a delaminated and highly
> processed or specially processed material but I haven't been able to find
> an explanation of what exactly this means???
I understand Kaopaque to be a Kaolin of "large" particle size. I believe I
found the following information on digitalfire's website:
KAOPAQUE 20
Large delaminated clay particles have an average diameter to thickness
(aspect) ratio of 11:1 compared to 6:1 for natural Kaolin
Median Particle Size (microns) 2.0
Maybe by searching Clayart's "archives", you may be able to find some
recipes.
I hope this helps,
Jim
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