Jump to content
Sign in to follow this  
TJR

Fixing a Runny Glaze

Recommended Posts

TJR    359

I have been testing this glaze, and I like the surface-kind of a bright Celadon without the colourants. I want to prevent it from running as it does now. I know that I need to up the clay content, but by what percentage? How much kaolin can I add without changing the character/shininess of the glaze?

Here's the recipe

Cone 10 reduction

Synthetic Ash.

Potash feldspar 33

Whiting 33

Albany slip 13

Kaolin[EPK[ 5

Bentonite 5

Bone Ash 3.5

Dolomite 2.5

Silica[flint] 1.5

------

96.5

Red Iron ox. 3

Cobalt carb. 1.5

Total 100

Share this post


Link to post
Share on other sites
Mark C.    1,806

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.

If its to much cut that to 1/2 of double.

There will be a point that it gets dry as EPK has so much silica and alumina.

Good luck testing

Mixing a few tests today for this weeks glaze fire as well.

Share this post


Link to post
Share on other sites
TJR    359

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.

If its to much cut that to 1/2 of double.

There will be a point that it gets dry as EPK has so much silica and alumina.

Good luck testing

Mixing a few tests today for this weeks glaze fire as well.

 

 

Mark;

I am thinking like 5%, then another 5%, then another 5% in the same cup.

Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over.

Tom.

Share this post


Link to post
Share on other sites
Mark C.    1,806

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.

If its to much cut that to 1/2 of double.

There will be a point that it gets dry as EPK has so much silica and alumina.

Good luck testing

Mixing a few tests today for this weeks glaze fire as well.

 

 

Mark;

I am thinking like 5%, then another 5%, then another 5% in the same cup.

Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over.

Tom.

 

 

 

Holiday is over thats for sure-fire two kilns this weekend

Mixed glazes today-will glaze a load on Monday

Just did Arizona show and next show is in two weeks at UC Davis in middle of California near Sacramento

galleries need pots now and the list goes on-

Holiday seems like a distant memory

At least we have some Great spring weather.

I like the 5 then 5% deal as you will see right away whats going on.

Mark

Mark

 

 

Share this post


Link to post
Share on other sites
neilestrick    1,381

Just adding EPK can stiffen it up, but can also alter the surface because it changes the silica/alumina ratio. To keep the ration consistent while stiffening it up, add equal parts EPK and flint (silica). Start with 2% each, and go up in 2% increments.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×