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microwaves, cm and richard eppler

updated fri 24 feb 06

 

Daniel Semler on tue 21 feb 06


Hi All,

Just got to reading the answers column in CM Feb 2006. The first question is
on microwaves and crazing. In his answer Richard A. Eppler speaks about heating
and microwaves and pottery. He talks about both the glaze composition stating
that high conductive metal content ought to be avoid and specifically mentions
avoiding high iron oxide content. He goes on to speak of body absorption as
another factor.

So, does anyone know if either his and Douglas Eppler's Glazes and Glass
Coatings or, his and Mimi Obstler's recent Understanding Glazes address this
question at all ?

(Note, that I'm assuming that Richard Eppler and Richard A. Eppler are one and
the same though readily available bibliographical details aren't conclusive on
this point.)

Thanx
D

John Hesselberth on tue 21 feb 06


On Feb 21, 2006, at 11:03 AM, Daniel Semler wrote:

> So, does anyone know if either his and Douglas Eppler's Glazes
> and Glass
> Coatings or, his and Mimi Obstler's recent Understanding Glazes
> address this
> question at all ?

Hi Daniel,

I have Eppler and Eppler and can find nothing in it that addresses
the question. If it does it didn't make it to the obvious places in
the index. You will find this question was discussed on Clayart 2-3
weeks ago so check the archives for comments/questions raised at that
time. I think we should all write CM asking for clarification since
several of us have tested glazes having high levels of RIO and seen
no problem IF the clay body was well vitrified and did not absorb
more than 2-3% water. I remember only 1 person reporting a problem
with a pot she thought was well vitrified, but I don't remember
seeing any resolution of that apparent anomaly. I would like to have
a reference to Eppler's data supporting this if one exists.

Regards,

John

Jennifer Boyer on tue 21 feb 06


I'm that person with the anomoly and am planning some additional
testing in my next firing. I''ll do an absorption test on my clay and
remix the glaze tests.
More later!
Jennifer
On Feb 21, 2006, at 12:51 PM, John Hesselberth wrote:

> On Feb 21, 2006, at 11:03 AM, Daniel Semler wrote:
>
>> So, does anyone know if either his and Douglas Eppler's Glazes
>> and Glass
>> Coatings or, his and Mimi Obstler's recent Understanding Glazes
>> address this
>> question at all ?
>
> Hi Daniel,
>
> I have Eppler and Eppler and can find nothing in it that addresses
> the question. If it does it didn't make it to the obvious places in
> the index. You will find this question was discussed on Clayart 2-3
> weeks ago so check the archives for comments/questions raised at that
> time. I think we should all write CM asking for clarification since
> several of us have tested glazes having high levels of RIO and seen
> no problem IF the clay body was well vitrified and did not absorb
> more than 2-3% water. I remember only 1 person reporting a problem
> with a pot she thought was well vitrified, but I don't remember
> seeing any resolution of that apparent anomaly. I would like to have
> a reference to Eppler's data supporting this if one exists.
>
> Regards,
>
> John
>
> ______________________________________________________________________
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*****************************
Jennifer Boyer
Thistle Hill Pottery
Montpelier, VT
http://thistlehillpottery.com
*****************************

John Britt on tue 21 feb 06


John,

Have you lifted the ban on posting the MC6 Glazes on clayart?



Thanks,

John Britt
www.johnbrittpottery.com

Daniel Semler on wed 22 feb 06


Hi John,

Thanx. This is why I brought it up.

> You will find this question was discussed on Clayart 2-3
> weeks ago so check the archives for comments/questions raised at that
> time.

> I think we should all write CM asking for clarification since
> several of us have tested glazes having high levels of RIO and seen
> no problem IF the clay body was well vitrified and did not absorb
> more than 2-3% water.

A good idea. I'd write to Richard if I had an address, but none
was published with his response, so I'll ping CM when I have
a minute. I too would love to see data on this.

Thanx
D

Ron Roy on wed 22 feb 06


Hi Daniel,

Nothing in the index of glass coatings - it's not an easy read for most
potters by the way - I think the colaboration with Mimi was to make it more
accessable for potters.

Re his thoughts on microwavable - any sigh of any experiments or is it just
opinion?

RR

>Hi All,
>
> Just got to reading the answers column in CM Feb 2006. The first question is
>on microwaves and crazing. In his answer Richard A. Eppler speaks about heating
>and microwaves and pottery. He talks about both the glaze composition stating
>that high conductive metal content ought to be avoid and specifically mentions
>avoiding high iron oxide content. He goes on to speak of body absorption as
>another factor.
>
> So, does anyone know if either his and Douglas Eppler's Glazes and Glass
>Coatings or, his and Mimi Obstler's recent Understanding Glazes address this
>question at all ?
>
> (Note, that I'm assuming that Richard Eppler and Richard A. Eppler are
>one and
>the same though readily available bibliographical details aren't conclusive on
>this point.)
>
>Thanx
>D

Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513

Daniel Semler on thu 23 feb 06


Hi Ron,

No research data was presented. It was just an answer to an enquiry from a
potter with a crazing problem if their ware was microwaved.

> Re his thoughts on microwavable - any sigh of any experiments or is it just
> opinion?

Thx
D