Jump to content
Sign in to follow this  
Elizabeth 2

powdered underglazes

Recommended Posts

Does anyone have any tips for mixing under glazes in powder form with something which will keep them suspended rather than settling out within a day? Any ideas for a suspension agent that will help? If you buy the ready mixed ones they don't settle out so there must be something that is added. I would much appreciate any comments.

Share this post


Link to post
Share on other sites

Does anyone have any tips for mixing under glazes in powder form with something which will keep them suspended rather than settling out within a day? Any ideas for a suspension agent that will help? If you buy the ready mixed ones they don't settle out so there must be something that is added. I would much appreciate any comments.

 

There are other things you can do but probably the quickest and easiest is to add ~2% Bentonite and/or a pinch of Epsom Salt.

 

Jim

Share this post


Link to post
Share on other sites

Does anyone have any tips for mixing under glazes in powder form with something which will keep them suspended rather than settling out within a day? Any ideas for a suspension agent that will help? If you buy the ready mixed ones they don't settle out so there must be something that is added. I would much appreciate any comments.

 

 

I buy an underglaze medium which comes in liquid form (I'm in the UK so maybe this is called something else in USA) which I add to the underglaze powder and water which gives the same consistency as the ready mixed ones. It took me a while until I discovered this and struggled for a long time with just the powder and water.

Share this post


Link to post
Share on other sites

From Spectrum site, the first product is to add stains to, would that work? first on the following link:

 

http://www.spectrumg...com/miscpg.html

 

I would guess other suppliers have a similar product if Spectrum isn't available by you. I think it contains a colloid which keeps everything dispersed evenly. They also have a brushing medium which I would assume is just a CMC solution.

 

Min

Share this post


Link to post
Share on other sites

Does anyone have any tips for mixing under glazes in powder form with something which will keep them suspended rather than settling out within a day? Any ideas for a suspension agent that will help? If you buy the ready mixed ones they don't settle out so there must be something that is added. I would much appreciate any comments.

 

 

There are other things you can do but probably the quickest and easiest is to add ~2% Bentonite and/or a pinch of Epsom Salt.

 

Jim

 

Share this post


Link to post
Share on other sites

CMC gum solution. Many commercial glaze companies use a fair amount of this in their products as well as other gums/bentonite/hectorite, etc to help with suspension and brushability. It will help with suspension similar to bentonite and epsom salts (and you can even use both/all) -- but an additional benefit is that when it dries, the CMC forms a sort of "hard shell/candy coating" similar to that of dried snot/snail trail - it sounds gross, but when dry it will help keep the glaze where you put it and be more abrasion resistant to your hands or additional brushwork before being fired. It also helps the material to "flow" and be more brushable.

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  

×