Pamela 0 Report post Posted September 14, 2011 I have a glaze recipe I haven't used in about 40 years. It contains 52% feldspar and the firing temperature given is 1250. My current kiln only fires to 1000 so can I substitute borax for the feldspar to lower the ffiring temperature? Thanks for any help you can give me. Quote Share this post Link to post Share on other sites
Matt Katz 14 Report post Posted September 15, 2011 I have a glaze recipe I haven't used in about 40 years. It contains 52% feldspar and the firing temperature given is 1250. My current kiln only fires to 1000 so can I substitute borax for the feldspar to lower the ffiring temperature? Thanks for any help you can give me. No, The substitution is more complicated than that. I would have to say that you need to look for a new batch of formulas. Your old formula is basically ^6 and you kiln is fining under ^04. Quote Share this post Link to post Share on other sites
