Penny_Swanson@Douglas.BC.CA on tue 29 apr 97
Is mulite (sp?) the same as kyanite for the purposes of the Combo Kiln Wash
recently posted on Clayart?
Thanks.
Penny Swanson
Technical Services Librarian
Douglas College Library, New Westminster, B.C. Canada
Internet: swansonp@douglas.bc.ca Voice: (604) 527-5259
Robert Compton on wed 30 apr 97
Penny_Swanson@Douglas.BC.CA wrote:
>
> ----------------------------Original message----------------------------
> Is mulite (sp?) the same as kyanite for the purposes of the Combo Kiln Wash
> recently posted on Clayart?
>
> Thanks.
>
> Penny Swanson
> Technical Services Librarian
> Douglas College Library, New Westminster, B.C. Canada
> Internet: swansonp@douglas.bc.ca Voice: (604) 527-5259
Penny,
Mullite is the calcined form of Kyanite. It is a high Alumia
mineral. In your application I expect mullite would do just fine. I used
it for years in my clay body instead of hi silica grog, and it made a
wonderful hard, chip resistant body. However it reacts pooly (does not
take salt glaze well) in my salt kiln for obvious (alumina) reasons.
--
Robert Compton Phone: 802-453-3778
3600 Rt 116 http://homepages.together.net/~rcompton
Bristol, Vermont 05443 rcompton@together.net
Ric Swenson on wed 30 apr 97
>----------------------------Original message----------------------------
>Is mulite (sp?) the same as kyanite for the purposes of the Combo Kiln Wash
>recently posted on Clayart?
>
>Thanks.
>
>
>Penny Swanson
>Technical Services Librarian
>Douglas College Library, New Westminster, B.C. Canada
>Internet: swansonp@douglas.bc.ca Voice: (604) 527-5259
-----reply--------------
hope this helps you...
The simple answer is no. BUT...
I believe you will find that Mullite...as sold by the Kyanite Corp in
Dillwyn, Georgia is a raw kyanite material which has been calcined (fired)
and re-ground. Mullite, available in many mesh sizes is pre-shrunk, so to
speak. Raw Kyanite , which does not have a big shinkage anyway would make
a good addition to kiln wash or to a body (10 % is a good place to start.)
I found this material works well to help counteract dunting in fast fire
(tunnel 4 hour cycle dinnerware) Keith kiln. Especially helpful in larger
pieces...which "like" to dunt more anyway.
Contact Kyanite Corp. An interesting material.
anybody know their 800 number?
Check your local supplier of clay materials...
Ric Swenson, Bennington, VT
rswenson@bennington.edu
rswenson@bennington.edu
Ric Swenson, Bennington College, Route 67-A, Bennington, Vermont 05201-6001
802 442-5401 vox 262 fax 237 or direct fax 802 442-6164
WardBurner@aol.com on thu 1 may 97
Kyanite Mining Corp telephone number (804) 983-2043. But, I would call your
local clay supplier before I call these folks unless you intend to buy
pallets of the stuff.
Kyanite (3Al2 O3 3SiO2)
PCE runs about 36-38
Spec. gravity of 3.0
at 2750F kyanite decomposes into mullite and silica
This is a great material for addition to Raku bodies or home made
refractories. It has an interlocking matrix than forms upon firing. It will
also expand during firing which helps offset high shrinkage in the base clay.
I started using it about 12 years ago when you could only get it from the
mine in Dillwyn, VA. Most suppliers now carry it in a couple of mesh sizes
and most makers of Raku clay now include it in their formulas.
Marc Ward
Ward Burner Systems
PO Box 333
Dandridge, TN 37725
USA
423.397.2914 voice
423.397.1253 fax
wardburner@aol.com
stevemills on thu 1 may 97
In message <9704281642.AA01523@Douglas.BC.CA>,
Penny_Swanson@Douglas.BC.CA writes
>----------------------------Original message----------------------------
>Is mulite (sp?) the same as kyanite for the purposes of the Combo Kiln Wash
>recently posted on Clayart?
>
>Thanks.
>
>
>Penny Swanson
>Technical Services Librarian
>Douglas College Library, New Westminster, B.C. Canada
>Internet: swansonp@douglas.bc.ca Voice: (604) 527-5259
Kyanite is in fact a mullite, and has a needle like
structure like all that group, however Kyanite's
needle form is also somewhat jagged which
considerably increases shock resistance when
added for example to Raku bodies, as it forms a
sort of "felt" in the clay. I believe 30% is about
the right amount, I certainly found it so.
--
Steve Mills
@Bath Potters Supplies
Dorset Close
Bath
BA2 3RF
UK
Tel:(44) (0)1225 337046
Fax:(44) (0)1225 462712
Susan L. Ross on tue 11 nov 97
Another question:
I picked up a tip from somebody here on Clayart about a kiln wash that called
for Kyanite. I couldn't find Kyanite in my supply catalog nor could I find a
definition of it in my reference books.
What is Kyanite and where would I find it?
Thanks again --
Su
Potting in Piedmont, CA
Wet-n-refreshed
Stephen Mills on fri 14 nov 97
Reference a previous thread on the list: Kyanite is a form of Mullite,
jagged in shape, and non-porous. brilliant as a "grog" especially in
Raku type bodies as it really knits the clay together. I suppose it
could be used on kiln batts, in the manner of Molochite or Alumina
Hydrate i.e. dusted on rather than a wash. It is mined (believe it or
not)by the Kyanite corporation!!! Time to dust off your Sherlock Holmes
kit and follow that lead.
Steve.
In message , "Susan L. Ross" writes
>----------------------------Original message----------------------------
>Another question:
>
>I picked up a tip from somebody here on Clayart about a kiln wash that called
>for Kyanite. I couldn't find Kyanite in my supply catalog nor could I find a
>definition of it in my reference books.
>
>What is Kyanite and where would I find it?
>
>Thanks again --
>
>Su
>Potting in Piedmont, CA
>Wet-n-refreshed
>
--
Steve Mills
Bath
UK
home tel: (44) (0)1225 311699
work tel: (44) (0)1225 337046
Sarah Barnes on sat 15 nov 97
Watson to the rescue. The Kyanite Mining Corporation is in Dillwyn,
Virginia. Phone is 804-983-2043. They are very nice and will ship small
quantities (50lbs). It is much less expensive to buy it through them then
anyone else. The difference betwee 17 cents ber pound and 60.
Sarah
sbarnes@mica.edu
On Fri, 14 Nov 1997, Stephen Mills wrote:
> ----------------------------Original message----------------------------
> Reference a previous thread on the list: Kyanite is a form of Mullite,
> jagged in shape, and non-porous. brilliant as a "grog" especially in
> Raku type bodies as it really knits the clay together. I suppose it
> could be used on kiln batts, in the manner of Molochite or Alumina
> Hydrate i.e. dusted on rather than a wash. It is mined (believe it or
> not)by the Kyanite corporation!!! Time to dust off your Sherlock Holmes
> kit and follow that lead.
> Steve.
>
> In message , "Susan L. Ross" writes
> >----------------------------Original message----------------------------
> >Another question:
> >
> >I picked up a tip from somebody here on Clayart about a kiln wash that called
> >for Kyanite. I couldn't find Kyanite in my supply catalog nor could I find a
> >definition of it in my reference books.
> >
> >What is Kyanite and where would I find it?
> >
> >Thanks again --
> >
> >Su
> >Potting in Piedmont, CA
> >Wet-n-refreshed
> >
>
> --
> Steve Mills
> Bath
> UK
> home tel: (44) (0)1225 311699
> work tel: (44) (0)1225 337046
>
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