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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 05:16 PM
*****

Posts I've Made

In Topic: Qotw: Do You Have A Story For Us, Featuring Tom Roberts (Aka Tjr) ?

Today, 03:33 PM

I was not expecting that in QOTW. He will be missed so much.


In Topic: Qotw: Do You Have A Story For Us, Featuring Tom Roberts (Aka Tjr) ?

Today, 03:30 PM

:(


In Topic: Who Makes The Best Gas Kilns?

Today, 03:24 PM

I second building the kiln and the power burners if you are that way inclined. Half the price and 100x the knowledge at the end. 


In Topic: In Search Of A Cone 6 Clear...long-Winded.

Today, 03:08 PM

I think it is always best to try and remove any assumptions you have about the process and melt as many different mixtures of rock as possible. If I can nudge you in the direction of a curry tile as it would make your life much easier for testing a range of different silica/alumina values to see what happens. It is going to be a little difficult with the 80% one thing but could help the bubbles.

 

In regards to limit formula I believe taking the lower limits can produce as durable a glaze as taking the higher limits. As Nerd says silica alumina ratio seems to be the key with getting the best glaze dance happening. I am still making a few assumptions as never done a leach test with anything, only soaked in vinegar for 5 days and attacked with a knife and fork. If you look at the limits they give you a ratio between 7.5 and 8.5.

 

I ran tests with double the amounts of silica/alumina to flux but can't remember the specifics. I do know there was little difference in the final outcomes. There will be an old post around somewhere.

 

I think dropping the silica and alumina is what you want to do. Calcium level doesn't seem low for me.


In Topic: Different Firing Rate/speed When Firing Pottery Vs. Ceramics?

Today, 02:37 PM

Ceramics is a very wide term for metal-nonmetal oxide, nitrides, carbides and sulphides. Pottery is pots.

 

I don't see the big difference between an 8 hour cone6 firing or a 12 hour one.