David & Diane Chen on fri 28 may 99
my supplier has sold me some clay for tiles that they claim is fine for =
firing
between cone 02-10. Most of my experience is with cone 6 so I'll probably =
fire
to 6, but how can a clay have that wide a firing range. Wouldn't you not =
have
the desired hardness at 02? It apparently has a fair amount of grog in it =
if
that is a clue for anyone. Used for tile and sculptural pieces.
Diane
Massachusetts
Ron Roy on wed 2 jun 99
Yes - many suppliers do that - it's rediculus. You will have to fire the
clay at different temps - or the temp you want to fire at and find out the
shrikage and absorbancy. Let me know if you need to know how to do that.
You need a clay which vitrifies to about 2% absorbency to make sure ware
will not leak or absorb water.
I assume you have not registered for the course - there are only two
registered and they will not run it unless there are 10.
RR
>----------------------------Original message----------------------------
>my supplier has sold me some clay for tiles that they claim is fine for firing
>between cone 02-10. Most of my experience is with cone 6 so I'll probably fire
>to 6, but how can a clay have that wide a firing range. Wouldn't you not have
>the desired hardness at 02? It apparently has a fair amount of grog in it if
>that is a clue for anyone. Used for tile and sculptural pieces.
>
>Diane
>Massachusetts
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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