Why do this? We did not have it in stock and customers needed to mix recipes. When the chemistries of the two feldspars are very similar substitution is often not a problem, especially when a recipe only calls for 5 or 10%. However, when a recipe calls for a significant percentage the situation becomes much trickier (in our cone 6 test recipe, "Perfect Clear", 40% Minspar is needed). Feldspars are almost a glaze in themselves, just needing silica and alumina to shift their chemistry toward 'glazedom'. In this project I calculated a mix of materials, in my Insight-live.com account, that sources the same chemistry as Minspar. I made a cone 6 GLFL test comparing the Minspar and Minspar substitute (left) and comparing the Perfect Clear glaze with each feldspar (right). As you can see, the similarity in melt flow is stunning! This is a real demonstration of just how practical and valuable glaze chemistry calculation can be.
Insight-Live share on how I calculated a substitute for Minspar
This shows the chemistries side-by-side and the glaze recipe I used to compare the performance. And various pictures.
Create a Synthetic Feldspar in Insight-Live
A step-by-step of how to duplicate the chemistry of Minspar by mixing other materials. You will learn the calculate process, the type of testing to do and how to keep track of the results with notes, pictures and links.