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Feldspar Substitutions?


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#1 clay lover

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Posted 17 April 2014 - 09:00 AM

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?



#2 Min

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Posted 17 April 2014 - 10:22 AM

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.

#3 neilestrick

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Posted 17 April 2014 - 11:17 AM

Post the recipe and we'll se what we can do.


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#4 clay lover

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Posted 17 April 2014 - 12:51 PM

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



#5 Min

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Posted 17 April 2014 - 01:17 PM

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)



#6 clay lover

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Posted 18 April 2014 - 06:56 AM

Thank you! :)

now I can get busy mixing this glaze.



#7 Chris Throws Pots

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Posted 20 April 2014 - 07:12 AM

I have used Minspar 200 in substitution for F4 in several ^6 ox glazes with success. I have seen no differences in the results between pieces glazed with the original or adjusted recipes.

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