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Campana Kiln Wash


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#1 Biglou13

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Posted 02 August 2014 - 01:19 PM

Just made recipe

2500 epk
2500 glomax
5000 alumina
4250 h20
20 Darvan


It's settling like mad.


Only what is alumina. That is how bag is labeled. I'm guessing I had wrong one

Alumina hydrate vs alumina oxide........

At this point I may "floc". To suspend???!!!!

Frustrated.........
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
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#2 JBaymore

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Posted 02 August 2014 - 02:06 PM

Potters often toss around the term "alumina" and can mean EITHER one of the ones you mentioned.  USUALLY it is alumina hydrate... because it is cheaper.

 

If you went over on the Darvan... that could be the settling issue. Amount is "one single drop" critical.

 

But you are also WAY heavy on non-suspendables in that recipe.

 

best,

 

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


John Baymore
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Professor of Ceramics; New Hampshire Insitute of Art

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#3 Biglou13

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Posted 02 August 2014 - 03:43 PM

I weighed to the gram on all........
W
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
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#4 JBaymore

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Posted 02 August 2014 - 03:53 PM

Grams are often not close enough on defloculants. The usual approach is to add almost all of it,.... but not all.  Then drop by drop... add in the last until you get what you want. Local water chemistry affects things.

 

best,

 

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


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Professor of Ceramics; New Hampshire Insitute of Art

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#5 Min

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Posted 02 August 2014 - 04:05 PM

On Campanas site he has the Davan 7 at 25 grams. Did you read the order in which he adds the ingredients, don't have a clue if this would make a difference.

 

http://jeffcampana.c...ling-kiln-wash/



#6 Biglou13

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Posted 02 August 2014 - 05:09 PM

The other thing is bottle is just marked darvan.

I'm desperation I added flocs just enough to suspend.

Second thing was shelves need to be near saturated prior to application just sponged wet and it dried instantly

There were a few shelves different than the rest that were outside after grinding and got rained on these performed as in pictures and self leveled.

I'm pretty sure I didn't have alumina hydrate it's supposed to suspend better.

Majority of shelves have uneven wash on them I may sand lightly tomorrow. (Group studio is closed no one will see bad shelves)

Any thing will be better than what was there to start with.

I'm chalking this experience up to "testing"

What's your opinion on washes that add a bit of flux. Eg nepsy?
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#7 Min

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Posted 02 August 2014 - 05:24 PM

What's your opinion on washes that add a bit of flux. Eg nepsy?

 

my 2 cents worth, 

 

nooooooooooooo



#8 JBaymore

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Posted 02 August 2014 - 07:56 PM

 

What's your opinion on washes that add a bit of flux. Eg nepsy?

 

my 2 cents worth, 

 

nooooooooooooo

 

 

NOOOOOOOOOOOOOOOOOOOOO !

 

best,

 

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


John Baymore
Immediate Past President; Potters Council
Professor of Ceramics; New Hampshire Insitute of Art

http://www.JohnBaymore.com

#9 Biglou13

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Posted 02 August 2014 - 09:06 PM

The no's have it!
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#10 S. Dean

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Posted 03 August 2014 - 03:23 AM

Biglou13

 

Per the link from Min, Glomax should be 2500g. Is the 2599 in your recipe a typo?

 

-SD



#11 Biglou13

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Posted 03 August 2014 - 07:35 AM

Biglou13
 
Per the link from Min, Glomax should be 2500g. Is the 2599 in your recipe a typo?
 
-SD

Corrected
Yes typo

Since shelves are uneven from rough application of kiln wash, I'm planning a light sanding to even out surface. Pros, cons?
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#12 Mark C.

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Posted 04 August 2014 - 11:18 PM

Grind them as flat as you can-what are they made of?????

-kiln shelves come in many flavors

Mark


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www.liscomhillpottery.com

#13 Biglou13

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Posted 05 August 2014 - 07:45 PM

Shelves are flat
Kiln wash is a little textured....
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#14 Mark C.

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Posted 05 August 2014 - 11:44 PM

Grind them as flat as you can-what are they made of?????

-kiln shelves come in many flavors

Mark

Are they silcon carbide?

mullite?

dry pressed high alumina or

advancers

or chinese advancer knock offs?

just plain electric mullite shelves?

Many flavors my friend

Mark


Mark Cortright
www.liscomhillpottery.com

#15 Biglou13

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Posted 06 August 2014 - 04:49 AM

Mullite, corderite....
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#16 Mark C.

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Posted 06 August 2014 - 10:43 AM

Mullite, corderite....

Very soft and easy to overgrind holes on those babies-

Mark


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www.liscomhillpottery.com

#17 JBaymore

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Posted 06 August 2014 - 12:08 PM

Very true Mark.


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#18 Biglou13

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Posted 06 August 2014 - 11:05 PM

Yes I found out fast. The first shelf has some battle scars......... (Thank god the shelf wash hides those)
I now use grinder with diamond pad parallel to surfaces. I think it would be smarter now to get rigid backing pad vs. semi.
50 grit pads worked well, almost too well. I'd suggest using 100 grit unless there is glaze direct on shelves. 200 was pretty much waste of time. I grounds 5 22" full shelves and 2 1/2 shelves in under an hour. Making shelf wash and coating is another issue. [All while Getting sassed at studio for leaving extension cord out is another issue, after donating my time, including research, buying grinder, buying diamond pads, buying 1/2 face mask, cutting my Hand on crappy shelves, grinding shelves, making kiln wash, coating shelves, cleaning after coating, drying, cleaning area after coating indoors, drying, re hand sanding to soften texture, then running a low temp dry cycle on the kiln that I change relays and wiring harness that layer defunct for years prior to my arrival, diagnosed further issues. that I ran QC and tested to get a perfect cone six top to bottom, all as volunteer and as donated time, not to mention the spectacular glaze gallery I'm developing (ok they had two dipping non commercial glazes before I showed up). Mopping the studio multiple times, the whole studio.Then you have the gall to put notes around the studio accusing me wrongly of leaving a mess , with my name on it. (Slander) To some one who as donated considerable time and monetary value to studio, you just barked up the wrong tree. Maybe I I have old school standards but I will not and cannot tolerate your disrespect!!!!!!!!!...don't you know I love pottery I have no agenda.........I hope you read this......Rant off] as you previously may have read there are 2 readily available alumina' one suspends better than another. Clarify which one before using.

After action report.....

So much of the shelves drank up the wash leaving them a bit textured after wash.
The two that were left in the rain, were some what saturated these two (1/2 shelves) actually "self leveled" the kiln wash as stated in article.
But that was due to the shelves not eating up wash, (because they were wet) Like a dry piece of bisque eats up a glaze.
These to cracked a bit (slightly...think parched earth in a few spots ) , thinner coating than others, no biggie I'll add more coats as necessary. One shelf needed up with a greenish tint ( I'll let u chemistry gurus mull on that). The others after bisque fire came out white coated well, no cracking no peeling. But even with post coating pre bisque sanding , Have some texture, and some shelves are coated somewhat "thickly".

Well the true test will lie in cone 6 firing. ........ Later this week. Report later
Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#19 JBaymore

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Posted 07 August 2014 - 09:56 AM

If you soak the shelves to get the self leveling....... you may find that you have to let them dry a long time before use. 

 

DO NOT get Advancers wet!!!!!!!!!!!  The explode... with GREAT force.  Even when you THINK they should be dry.

 

best,

 

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


John Baymore
Immediate Past President; Potters Council
Professor of Ceramics; New Hampshire Insitute of Art

http://www.JohnBaymore.com




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