Khaimraj Seepersad on thu 5 aug 99
Hello Ron ,
would 3124 be considered a Glaze ?
If not , which Frit is considered a complete Glaze ?
Or what makes a Glaze complete ?
Khaimraj Seepersad
----------------------------Original message----------------------------
Ron Roy said
I'll list the analysis below for each -
Frit 3124 has 13.7% boron.
Frit 3134 has 23.1% boron. There is another benefit to 3134 - no alumina -
in 3124 there 9.9% Al2O3. This means you can get less raw clay in the
bucket with 3124 - and fritted glazes are more difficult to keep suspended.
All that starts to change when you are having problems with too much clay
in the bucket - then 3124 becomes more attractive cause it will supply some
of the Al2O3 and you can then lower the raw clay - but again it's gona cost
you cause it has less boron and you will have to use more to supply the
B2O3 you need.
Frit 3124
SiO2 - 55.3
Al2O3 - 9.9
K2O - 0.7
Na2O - 6.3
CaO - 14.1
B2O3 - 13.7
Frit 3134
SiO2 - 46.5
Al2O3 - none
K2O - none
Na2O - 10.3
CaO - 20.1
B2O3 - 23.1
More than you needed I'm sure but looking at frits with an eye to what you
need or don't need will help solve glaze problems and lower costs.
RR
Ron Roy on sat 7 aug 99
Hi Khaimraj,
It depends what temperature you fire it to - looks like it would be a
passable glaze from 04 up to 3 or 4 using the Seger limits but using limits
that include boron - not at any cone. These limits are an attempt to
forecast melt - and we know it melts well before cone 04. melted material
always takes less heat to soften. The problem with using pure frit becomes
how to keep it in suspension and cost.
What makes a complete glaze: A simpler answer would be Flux, alumina and
silica - but the proportions will vary depending on what cone you want it
to melt at, what surface qualities you want, what kind of colour response
and what expnsion your clay requires.
It is tempting to assume there are simple answers to clay and glaze
technology - and we all seem to want the simple answer. I see it all the
time on this list - just do this, or try that - find a simple answer to the
problem and hope it goes away. The best and most appropriate answers come
when understanding the technical side. We have to keep reminding ourselves
- what works for them may be completely inappropriate for me.
Thanks for giving me the chance to get that off my chest - R
RR
>----------------------------Original message----------------------------
>Hello Ron ,
>would 3124 be considered a Glaze ?
>If not , which Frit is considered a complete Glaze ?
>Or what makes a Glaze complete ?
>Khaimraj Seepersad
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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