Richard Gralnik on fri 27 jun 97
Bob,
There have been discussions on clayart about using Calgon as a
(de-)flocculant (I don't think I'll ever get that straight).
Anyway, there was a general observation that only a specific kind of calgon
worked, and that it was discontinued due to phosphate pollution or something.
Does that apply to the "calgon as kiln wash flux" variety, and which type
of calgon should you use - dishwasher/hand wash/whatever?
Thanks,
Richard
thinking about pottery again now that the welding is done...
At 05:05 PM 6/10/97 EDT, you wrote:
>----------------------------Original message----------------------------
>All you have to do is to add a little Calgon to your kiln wash: 50% epk and
>50$ silica plus a little Calgon and add water, stir and brush on. There is
>just enough fluxing action in Calgon to prevent flaking, but it still works
>good to protect your shelves.
>Bob
>
>
stevemills on sun 29 jun 97
"Original" Calgon was essentially Sodium Hexameta-Phosphate, and is
still obtainable under the latter name. This is the one mostly used in
Terra-Sig. slips. S.H.P is certainly available in the UK don't know
about anywhere else.
Steve
in message , Richard Gralnik writes
>----------------------------Original message----------------------------
> there was a general observation that only a specific kind of calgon
>worked, and that it was discontinued due to phosphate pollution or something.
>Does that apply to the "calgon as kiln wash flux" variety, and which type
>of calgon should you use - dishwasher/hand wash/whatever?
>
--
Steve Mills
@Bath Potters Supplies
Dorset Close
Bath
BA2 3RF
UK
Tel:(44) (0)1225 337046
Fax:(44) (0)1225 462712
BobWicks@aol.com on tue 1 jul 97
Richard:
re: the use of Calgon in kiln wash..I'm finding that the Calgon does indeed
have a fluxing action on the kiln wash. I have had some trouble getting it
off the shelves so use it very sparingly. I haven't tried to calculate the
exact amount yet. I use Calgon mainly to create a good smooth mix in making
ceramic suspensions. Since I haven,t examined the formula for either of the
two Calgons that you mention, I would use it guardedly. It might be safer to
just use 1% Bentonite mixed with the EPK and Flint while it is dry to avoid
clumping. Adding deflocculants to kiln wash is tricky. I hope this helps
you out.
Bob
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