Pamela Regentin on sun 25 mar 07
I'm trying some new glazes in my next firing and I have a question about a soda spar I have and haven't used in years so have little memory of it. It is labeled "Minspar 200". Could someone enlighten me as to what kind of feldspar this is? My recipes call for soda spar F4 (which I do have) and I don't know what recipes fo use "minspar" in.
I also have a recipe for a carbon trap glaze that calls for soda ash. I read what Chappell says about it in "Clay and Glazes" and it sounds like a glaze with soda ash can only be mixed in small batches or it recrystalizes. I don't recall problems like this with the glaze at school. Any enlightening info on this subject would be helpful also.
I slept through too many chemistry classes way back when, so for me it has to be kept simple...
Thanks!
Pam
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Dannon Rhudy on mon 26 mar 07
I've used minspar to replace other soda spars
in all recipies that I have calling for soda spar.
Minspar is what is available to me here. I
haven't had any problems with the substitutions.
regards
Dannon Rhudy
It is labeled "Minspar 200". Could someone enlighten me as to what kind of
feldspar this is? My recipes call for soda spar F4 (which I do have) and I
don't know what recipes fo use "minspar" in.
Timothy Joko-Veltman on mon 26 mar 07
Pam,
Minspar is a soda spar. It is very close to F4 ... but will probably
melt a little earlier. However, it will also craze a bit more, too.
Hope that helps.
Regards,
Tim
Thomas Malone on mon 26 mar 07
Hello Pamela,
Neither Minspar not F4 are soda feldspars, they are both mixed feldspars.
They are, however, reasonably close and are a good bet for substitution
although based just on typical analyses F4 looks to be a slightly stronger
flux.
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