Potash Feldspar

Source:
http://ctmpotterssupplies.co.uk/ceramicmaterialsglossary.html
Updated: 16/09/2021
Aliases: Feldspar, Custer Feldspar
Components:
Formula Ratio
SiO2 65.80%
Al2O3 18.50%
K2O 11.30%
Na2O 3.20%

K2O 11.3%, Na2O 3.2%, Al2O3 18.5%, SiO2 65.8% typical For medium and high temperature glazes - if a recipe lists feldspar or felspar it probably means Potash Feldspar. If trying to identify some it is not as white as soda. Glazes with 35%+ feldspar are likely to produce crazing problems, more than 50% will be unbalanced and probably lack adquate glassy formers in the glaze.

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