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jrgpots

Member Since 15 Mar 2013
Offline Last Active Yesterday, 10:54 PM
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Posts I've Made

In Topic: White Glaze Issues.

21 July 2014 - 06:09 PM

I'm thinking to widen the firing range a small bit

you might try to tweak the glaze by taking  your Cornish stone down to 25-27 and upping the soda spar to13 to 15 to get a smoother melt with out movement, just a starting point for testing

Wyndham

I agree here.  You may want to add Ferro 3124 or 3134 frit to widen the melting range in your glaze. Start at 10% and do a line test in increments of 1-2%.  Ferro3134 would give the glaze a little more fluidity compared to 3124, if you wanted the glaze to be a little runny.

 

Jed


In Topic: Frits: Too Many Numbers And Too Little Info

21 July 2014 - 05:54 PM

You are thinking about frits from a marerials based approach,. And if ANY raw material is all about the chemistry... it is frits. That is why they were developed. To understand frits.... think of them as oxide suppliers. And then spend t ime understanding the glaze chemsitry behind what those frits were designed for.

 

Frit X is not a "low fire frit"..... it is a source of a large number of Z oxide relative to Y oxide with a trace of Q oxide, so that allows you to get the oxide balance in a glaze to the point you need to melt in this range or develop this color. And so on.

 

best,

 

........................john

Thank you John..........I'm still on the steep end of the learning curve.  By-the-way, how long is the learnig curve steep. On second thought....don't tell me.

 

Jed


In Topic: Frits: Too Many Numbers And Too Little Info

21 July 2014 - 05:51 PM

Frank Gaydos listed 116 Frits and equivalents here with breakdowns:

 

http://home.comcast....ydos/frits.html

 

Marcia

Thank you. That really helped.  I have saved a copy to my hard drive and paper collection.

 

Jed


In Topic: Frits: Too Many Numbers And Too Little Info

21 July 2014 - 12:26 AM

I went there first. It helps for common frits like Ferro 3134, 3124, 3110, but not many others.... I'm still confused!!!

What I would love is a chart that breaks down firing range, type frit and matching COE.
(kind of like the following.)
I' m not asking for much..... ;)....Right?


A. Low fire frits............................COE
.,............................. Lo........Med......Hi
1. Boron.
2. Lo aluminum
3. Hi aluminum
4. Lo calcium

B. Med fire frits
1.
2.
3.
4.

C. Hi fire frits
1.
2.
3.
4.

D Specialty frits.

It would be great to have 3 examples of each category giving a range of COE from lo, med, and hi.


So if there is an OCD potter out there that has anything like this alreday made up, please share.

Otherwise, my OCD tendencies will force me to expend much energy, try to create order, and go against the second law of thermodynamics.....yuk.

Jed


In Topic: Would Olivine If Added To A Glaze Produce Green Flakes?

18 July 2014 - 03:19 PM

Thanks Marcia and John. I have not found a single article or mention of using this stuff in glazes. There were articles about its use in foundry sands and that is about it. This time I might not be reinventing the wheel. On the other hand, there may be a good reason why it's not mentioned. We will see.

Jed