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clay lover

Feldspar Substitutions?

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I need to make anew bucket of a glaze I have used with good results that used soda feldspar .  Since I have 0 experience in reformulating glazes, which feldspar do you recommend I start testing with that will make the fewest changes?

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In my recipes that used K4 I am now using Minspar. There is a bit more silica in Minspar, the rest of the chemistry is fairly close. If you don't use a glaze program then myself or someone else here could do the conversion for you if you post your recipe.

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My materials supplier says use minspar 200, that it is the same thing ???


Thanks, guys!   :)



Recipe is as follows.


Sea foam Green  


Soda feldspar    41

EPK                     5

Silica                 27

Whiting              15

Zinc Oxide         12




titanium           5

copper carb     5

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You could probably just sub the minspar 1:1 for the soda spar. Was it F4 you were using before? If so and you want to get picky with a very close match the new recipe would be:


Minspar 200    41.6

Epk                   6.1

Silica                24.9

Whiting            15.2

Zinc                 12.2


total:                100


titanium            5

copper carb     5 


When I just use soda feldspar the rebalanced recipe would be;


Minspar    41.2

Epk            6

Silica        25.6

Whiting    15.1

Zinc         12.1


total:    100


titanium          5

copper carb   5


(Glaze calc done with Insight)

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