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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

 

 

Add;

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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