Roberta12 Posted April 27, 2016 Report Share Posted April 27, 2016 I am mixing up some test batches. I was going to mix up a glaze that requires F4 Feldspar. I looked at the feldspar chart in John Britt's book. Minspar appears to be close to F4 feldspar. Is it close enough? Since this is not horseshoes, thought I would ask. Roberta Link to comment Share on other sites More sharing options...
Min Posted April 27, 2016 Report Share Posted April 27, 2016 Minspar has a bit more silica, minor differences in other chemistry. I've been subbing Minspar for F4 1:1 for the past year or so and haven't noticed any differences in my glazes. Link to comment Share on other sites More sharing options...
Joseph Fireborn Posted April 27, 2016 Report Share Posted April 27, 2016 Same I use minspar 200 no issues. Link to comment Share on other sites More sharing options...
Roberta12 Posted April 28, 2016 Author Report Share Posted April 28, 2016 Joseph and Min. Thank you! roberta Link to comment Share on other sites More sharing options...
douglas Posted April 28, 2016 Report Share Posted April 28, 2016 We switched to Minspar for our glazes and did not notice a difference. Link to comment Share on other sites More sharing options...
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