Timakia@AOL.COM on thu 25 jan 01
I was just looking at the mug that I drank coffee out of minutes ago. I
originally glazed it with a barium glaze on the outside and reglazed it then
with a blue glaze. This morning I made instant coffee in the microwave. I
like my coffe hot!!. It did not burn my hand on the handle. So again, if
barium might be one of the reasons, will it be for the same reasons why it
leach out of glazes when not fired high enough?
Just thought this will interest you.
Dave your test mug is underway today.
You all have a good day.
Antoinette
Antoinette Badenhorst
PO Box 552
Saltillo,MS
38866
http://hometown.aol.com/timakia
Denis Caraty on mon 29 jan 01
As earthenware manufacturer I know your problem of hot handles. I don't know
if baryum has specificities about microwaves warming but a good raison to
hot handles in this case is the water contained in the body. Most cases of
hot handles with microvawes are due to water or vapor that penetrates into
the body during the ware washing. You can make a test with you mug after a
long drying (i.e. in your kitchen oven). After cooling you try it again in
the same conditions with the microvawes.
Denis Caraty
Societe : Faienceries de Gien
78, place de la victoire, 45500 Gien, FRANCE
Fax : (33) 2 38 67 92 36
mailto:dcaraty@gien.com
http://www.gien.com
-----Message d'origine-----
De : Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]De la
part de Timakia@AOL.COM
Envoye : jeudi 25 janvier 2001 18:01
A : CLAYART@LSV.CERAMICS.ORG
Objet : Hot handles:Can Barium the reason?
I was just looking at the mug that I drank coffee out of minutes ago. I
originally glazed it with a barium glaze on the outside and reglazed it then
with a blue glaze. This morning I made instant coffee in the microwave. I
like my coffe hot!!. It did not burn my hand on the handle. So again, if
barium might be one of the reasons, will it be for the same reasons why it
leach out of glazes when not fired high enough?
Just thought this will interest you.
Dave your test mug is underway today.
You all have a good day.
Antoinette
Antoinette Badenhorst
PO Box 552
Saltillo,MS
38866
http://hometown.aol.com/timakia
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George Mackie on tue 30 jan 01
Terry and others- I treat all my earthenware pots with the organosilicate
sealer you can buy in garden shops for winterizing terra cotta flower
pots. It stops them soaking up water, and they are much less prone to get
hot handles in the microwave. george
Terry Sullivan on tue 30 jan 01
Denis Caraty is right on the money about earthenware handles heating up in a
microwave. Some of you may recall we had this discussion about a year or so
ago.
I was wondering why , when heating water for tea, the handle and exposed rim
of the cup could get to hot to touch while the water was only warm. The clay
body was white earthenware ( cups from Cost Plus ). So I thought that
perhaps water was getting into the body through the raw uhnglazed bottom
edge. Especially in a dishwasher which uses high temp steam/water. The test
was to put a brand new , unwashed, cup and one that had been washed into the
microwave ( same cup from the same store). Sure enough; the new one stayed
cool and the empty washed one got to hot to handle without gloves.
When I turned it over there was steam/water bubbling out of the bottom rim.
So the water absorbed into the clay body was getting all the energy from the
microwaves and heating up the cup but not the water. Dosen't happen with
most stoneware bodies if the porosity is very low and there aren't other
factors like metalic oxides which react to microwaves.
My 2 1/2 cents,
Terry Sullivan
Director ( and Chief Gofer)
Nottingham Center for the Arts
San Marcos , CA
www.nottinghamarts.org
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