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jrgpots

Member Since 15 Mar 2013
Offline Last Active Yesterday, 10:46 PM
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Topics I've Started

Are Zinc/tin Oxides Active At Cone 6?

28 July 2014 - 08:06 PM

I found a nice recipe for a cone 6 chun red in reduction and pale green in oxidation.

Custer feldspar,..............428
Silica........................153
Whiting.......................133
Frit 3124.....................122
EPK.................. .........51
Zinc ox........................41
Talc,..........................31
Tin ox.........................21
Bentonite......................10
Copper carb....................10

I know zinc oxide is a great opacifier at low temp and pretty much sublimated at high temp, cone 10.

So here is my question. At cone 6 how much of the zinc is still around to influence the glaze? And, if it has minimal influence, do I need to use it?

Frits: Too Many Numbers And Too Little Info

20 July 2014 - 09:52 PM

Does anyone have a brief list of the most commonly used frits and their uses, properties, and effects?

Jed

Would Olivine If Added To A Glaze Produce Green Flakes?

18 July 2014 - 01:51 AM

I have a good supply of olivine, a magnesium iron silicate also known as paridot. The Insight database calls it a refractory that melts around 2800F. Would olivine dust of about 40 mesh when added to a glaze result in green flecks?

Does anyone have any experiance with it? If not, I will post my test tile results.

Jed

Chimney Build

03 July 2014 - 09:41 PM

I am drawing plans for a 15 cubic ft sprung arch downdraft kiln powered by 2 power blowers. The walls will be 9" thick. The power blower inlets will be 4" diameter. The outlet flue and chimney will be 8 x 4 1/2 internal dimensions.

The first of many question:
1. How high does the chimney need to be?
2. Can the bricks above the damper be K20 or less?

Jed

Bon Ami Whiting/feldspar Ratio?

19 June 2014 - 04:53 PM

I have about 10 lbs of Bon Ami cleaner that we don't use anymore. I thought about using it in a glaze. It is made up of limestone (whiting) and feldspar. But I can't find in the public domain the ratio between the two. Before I do a line blend, I wondered if anyone here had done so. I don't want to reinvent the wheel...... Anyone know of the ratio in Bon Ami?

Jed