Graeme Anderson on sat 19 feb 00
-------------------
Way back in the murky depths of my mind, I seem to recall reading/hearing =
that
zinc oxide could be used as a direct substitute for barium carb., if the
percentage of the glaze batch was not very high. If correct, would anyone
have any further info. on this? Many thanks.
Graeme Anderson. Gemopal Pottery. Lightning Ridge.Australia. 2834.
gemopal=40turboweb.net.au
Ron Roy on sun 20 feb 00
Nope - just ran the problem through my calculator - To replace 5% barium
you would need 2% zinc oxide.
If you try that in a reduction glaze it would be just like taking out the
barium cause the zinc will leave in a reduction firing and have no fluxing
effect.
To replace 5% barium use 2.5% whiting or 3.5 strontium for reduction glazes.
RR
>----------------------------Original message----------------------------
>-------------------
>Way back in the murky depths of my mind, I seem to recall reading/hearing that
>zinc oxide could be used as a direct substitute for barium carb., if the
>percentage of the glaze batch was not very high. If correct, would anyone
>have any further info. on this? Many thanks.
>Graeme Anderson. Gemopal Pottery. Lightning Ridge.Australia. 2834.
>gemopal@turboweb.net.au
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
| |
|
