Ron Roy on fri 3 jun 05
This looks like it may be a stable glaze - I have recalculated it with frit
3134.
The calculated expansion is on the low side without the zircopax - even
lower with 10% so it would be prudent to test this well on the clays you
are using before comitting to it. If you need to know how to test for fit
let me know.
It would not be hard to raise the expansion rate by the way.
With all that Neph Sy I thought it prudent to add some bentonite to try and
avoid hard panning of the glaze.
3134 - 27.0
Wollas - 6.0
Talc - 2.0
Neph Sy - 21.0
EPK - 18.0
Silica - 26.0
Bentonite - 2.0
Total - 102.0
Add 10% zircopax for opake shiny white at cone 6.
RR
>Well, I try again.............. This is the white we use here and it works
>great at cone 5 or 6.
>
>
>
>Gerstley Borate 840
>
>Wollastonite 320
>
>Neph Syenite 1200
>
>EPK 400
>
>Silica 1240
> ____________
> 4000 grams
>
>Ziropax 400 this is 10% of the above 4000 grams.
>
>You can vary the whiteness by increasing or decreasing the % of ziropax.
>
>Good luck. Gary
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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