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enbarro

Ultrox Superpax Zircopax-Plus, How To Choose?

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enbarro    2

Hi,

Anyone knows if ultrox is still in production? Or if Superpax and Zircopax plus are the same thing? How do they all compare?

 

My local store is out of Zircopax plus, so I need to order it... Uspigments doesn't sell it. They sell Zircopax which I thought was out of production. Ultrox is cheaper which is good, but I'm not sure if its still being made either.

 

I rather stick to materials that are going to be available in the future and minimize glaze testing.

 

Any help advice will be greatly appreciated.

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TJR    359

I use zircopax as an opacifier in glazes. I usually use 10%.

I have heard that for Superpax, you would only require 5% as it is a stronger opacifier.

I have not used Ultrox,

I have always used zirco. I hope I can still get it.

Tom.

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Mark C.    1,800

I use zircopax and have used superpax-I never changed recipes because of it.

Zircopax is what Laguna Clay sells

I know know zero about Ultrox

Zircopax has been around for a long time and thats my best guess for the future as well.

Mark

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Min    781

I could be dead wrong but isn't superpax a finer mesh size of zircopax? Last time I went to buy superpax (Seattle Pottery Supply) they didn't carry it so I bought zirco instead.  I need to add a couple percent more zirco than when I had superpax. No clue about Ultrox, never used it.

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TJR    359

I could be dead wrong but isn't superpax a finer mesh size of zircopax? Last time I went to buy superpax (Seattle Pottery Supply) they didn't carry it so I bought zirco instead.  I need to add a couple percent more zirco than when I had superpax. No clue about Ultrox, never used it.

See my post above. Two times zirco equals one superpax. Where are you located?

Tom.

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Min    781

 

I could be dead wrong but isn't superpax a finer mesh size of zircopax? Last time I went to buy superpax (Seattle Pottery Supply) they didn't carry it so I bought zirco instead.  I need to add a couple percent more zirco than when I had superpax. No clue about Ultrox, never used it.

See my post above. Two times zirco equals one superpax. Where are you located?

Tom.

 

Hi Tom,

I didn't actually find that I needed to double the zirco, I went from 9 superpax to 11 zirco in my white base. Just like everything else I guess it all depends...   I'm in BC.

Min

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Min    781

Maybe some industrious soul will run each of these through a glaze calculation software package and give us a side-by-side comparison.

Good idea, should have thought of that!

With Insight zircopax and superpax are identical for zirconium and silica amounts.

Ultrox has the same zirconium as the above but the silica is 0.01 higher.

Zircopax Plus isn't in the materials database

 

From my go to Tony Hansen "It is often used for semi-opaqueness (finer grained materials like Superpax provide more opacity). In North America, the most popular zirconium opacifiers fall under the brand names of Zircopax Plus, Superpax, Zircosil and Excelopax. These vary according to particle size, the finer the size the greater the scattering of light (and thus the better the opacification). In addition, the finer sized materials contain a little extra silica for maximum whiteness."

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enbarro    2

 

I found a pdf which shows that the difference between ultrox grades is the particle size. A few websites list superpax as comparable to ultrox ultra, but I'm yet to find the actual particle size of Superpax or Zircopax Plus...

 

From your feedback, I gather that to sub one for another is pretty straight forward. With the amount of silica and whiteness being the variables to keep in mind...

 

Thanks you all for the help!

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Mark C.    1,800

Zircopax and zircopaxplus is a one to one exchange -

Laguna now only sells zircopacplus I think-anyway its a one to one with zircopax.

Mark

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bciskepottery    925

Wondering if there might be a difference in the weight of the various materials (small mesh vs. medium mesh vs. large mesh) . . . that would preclude a 1 for 1 exchange in all instances.

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PeterH    87

>Thanks PeterH, I wasn't able to open the book on the link.

 

No you cannot, but you should be able to read at least that page (1039) and the few following.

... or even take "snapshots" of them and print.

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enbarro    2

What I understand is that the particle size is what changes the whiteness... when you add more of the larger particle size Zirconium Silicate to get the same white you had with the smaller particle one you also add silica to the recipe...

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