Deborah Thuman on mon 28 jan 08
Lisa Skeen said that ^04 can go in the oven but not the microwave
because ^04 is porous.
When I put a piece of ^04 in the oven, it ended up in pieces on the
oven floor. This was a glazed piece and was fired to ^04. No more ^04
in the oven for me.
^04 can't go in the microwave???? I've nuked some ^10 mugs (okay, I
nuked tea in ^10 mugs). I don't think I've tried ^04 in the microwave.
Do you mean the ^04 falls to pieces, blows up, or just gets hot?
Deb
http://debthumansblog.blogspot.com/
Ann Brink on mon 28 jan 08
Hi Deb,
Was the oven preheated before you put the dish in there? I advise my
customers to put the pan or whatever with food in it starting with a cold
oven to avoid thermal shock. I'm talking about earthenware fired to cone 05
or 04. I do wedge grog into the body and usually kyanite as well.
There can be a lot of difference in earthenware clay bodies...guess you had
the wrong one; it must have been upsetting. Aren't you glad it happened to
you and not a customer?
A friend of mine had me make several more pie pan shaped dishes of
stoneware; I found out she puts potato slices, etc. in them and sticks them
in a hot oven, and they've been fine. You never know. Also I have a
stoneware disc that I preheat and then put my frozen pizza on it, and it's
lasted several years..But I don't make them to sell. I've given a few to
friends, with a disclaimer. When I make the discs I add quite a bit of grog.
Ann Brink in Lompoc CA, having a short break from the rain
(mostly about pottery)
----- Original Message -----
From: "Deborah Thuman"
> Lisa Skeen said that ^04 can go in the oven but not the microwave
> because ^04 is porous.
>
> When I put a piece of ^04 in the oven, it ended up in pieces on the
> oven floor. This was a glazed piece and was fired to ^04. No more ^04
> in the oven for me.
>
>
Lynn Goodman Porcelain Pottery on mon 28 jan 08
On Jan 28, 2008, at 2:39 PM, Deborah Thuman wrote:
> Lisa Skeen said that ^04 can go in the oven but not the microwave
> because ^04 is porous.
>
> ^04 can't go in the microwave???? I've nuked some ^10 mugs (okay, I
> nuked tea in ^10 mugs). I don't think I've tried ^04 in the microwave.
> Do you mean the ^04 falls to pieces, blows up, or just gets hot?
I work in a studio with a potter who works in earthenware and glaze
fires to ^05. We nuke food in her pottery all the time (glazed all
over, stilted for the glaze firing) and have not had any problem with
stuff blowing up. Maybe because it is not dry-footed, water can't get
in.
Lynn
Lynn Goodman
Fine Porcelain Pottery
Cell 347-526-9805
www.lynngoodmanporcelain.com
Rod on mon 28 jan 08
Speaking of irresponsible information...
^04 Can't go in the oven is defiantly not correct. There is no magic in
glazes and clay bodies.
If someone put an ^04 piece in the microwave and it blew up ask yourself,
Why did this happen? A properly fitted glaze would not have allowed a porous
body to become saturated with fluid in the first place.
Just because one person says that a mug, etc. blew up when they put it in
the microwave defiantly does not make it true.
Lower fired glazes are a bit more of a challenge to get right than high
fire, but if you do your studying, ask the right questions you'll be
surprised at the amount of things people say can't be done actually can be.
If things are approached properly with knowledge without voodoo, chicken
heads and various forms of chanting you'll find your work much more
rewarding.
Cheers,
Rod
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Deborah Thuman
Sent: Monday, January 28, 2008 11:40 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: 04 and the microwave
Lisa Skeen said that ^04 can go in the oven but not the microwave
because ^04 is porous.
When I put a piece of ^04 in the oven, it ended up in pieces on the
oven floor. This was a glazed piece and was fired to ^04. No more ^04
in the oven for me.
^04 can't go in the microwave???? I've nuked some ^10 mugs (okay, I
nuked tea in ^10 mugs). I don't think I've tried ^04 in the microwave.
Do you mean the ^04 falls to pieces, blows up, or just gets hot?
Deb
http://debthumansblog.blogspot.com/
____________________________________________________________________________
__
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, change your
subscription settings or unsubscribe/leave the list here:
http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots2@visi.com
chris massingill on mon 28 jan 08
Hmmmm...I would like to hear some others on this, too as my ^03 in the microwave all the time and haven't had any problems. I have a white low fire stoneware from Armadillo Clay that I bisque to ^01 and then glaze to ^03. which I know sounds crazy, but if I don't bisque that high, my glazes bubble (from impurities in the clay?) I have been using this clay body and glazes for about 4 years with no troubles. Is there something I should know?
Thanks!
chris massingill
www.chrismassingill.com
----- Original Message ----
From: Deborah Thuman
To: CLAYART@LSV.CERAMICS.ORG
Sent: Monday, January 28, 2008 1:39:52 PM
Subject: 04 and the microwave
Lisa
Skeen
said
that
^04
can
go
in
the
oven
but
not
the
microwave
because
^04
is
porous.
When
I
put
a
piece
of
^04
in
the
oven,
it
ended
up
in
pieces
on
the
oven
floor.
This
was
a
glazed
piece
and
was
fired
to
^04.
No
more
^04
in
the
oven
for
me.
^04
can't
go
in
the
microwave????
I've
nuked
some
^10
mugs
(okay,
I
nuked
tea
in
^10
mugs).
I
don't
think
I've
tried
^04
in
the
microwave.
Do
you
mean
the
^04
falls
to
pieces,
blows
up,
or
just
gets
hot?
Deb
http://debthumansblog.blogspot.com/
______________________________________________________________________________
Clayart
members
may
send
postings
to:
clayart@lsv.ceramics.org
You
may
look
at
the
archives
for
the
list,
post
messages,
change
your
subscription
settings
or
unsubscribe/leave
the
list
here:
http://www.acers.org/cic/clayart/
Moderator
of
the
list
is
Mel
Jacobson
who
may
be
reached
at
melpots2@visi.com
____________________________________________________________________________________
Looking for last minute shopping deals?
Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping
John Hesselberth on tue 29 jan 08
On Jan 28, 2008, at 8:23 PM, chris massingill wrote:
> Hmmmm...I would like to hear some others on this, too as my ^03 in
> the microwave all the time and haven't had any problems. I have a
> white low fire stoneware from Armadillo Clay that I bisque to ^01
> and then glaze to ^03. which I know sounds crazy, but if I don't
> bisque that high, my glazes bubble (from impurities in the clay?)
> I have been using this clay body and glazes for about 4 years with
> no troubles. Is there something I should know?
>
>
Hi Chris,
Like most questions in craft of pottery-making, the answer is "it
depends". First there is the clay body. If it is well vitrified--say
to about 2% or less water absorption, the pot will normally survive
micro-waving regardless of whether the glaze is crazed or not. If the
clay is not vitrified to 2% or less (earthenware is usually about 10%
absorption) then you are dependent on the pot being completely
encased in a well fitting (uncrazed), well-formulated glaze to keep
water out of the body. It is water getting into the body that causes
pots to get extremely hot and sometimes break in the rapidly heating
microwave oven environment. If you work with earthenware you should
take great care to make sure the body and the glaze are well matched--
it can be a difficult task with earthenware but it can be done.
So any crazing or unglazed spots on an earthenware pot will
eventually cause problems and make it unsuitable in a microwave oven.
It may happen very quickly. It may take years to happen. Part of
that depends on how well the pot is cared for. If it is regularly put
in the aggressive environment of a dishwasher it is likely to happen
more quickly. But it is not just earthenware. Too many potters don't
check the absorption of their fired stoneware or porcelain bodies and
it can happen there too. That is particularly the case because the
bottoms of stoneware and porcelain are traditionally not glazed.
The same problem can happen in a regular oven but it is less likely
because the rate of heating is much slower even if the oven is
preheated. Again if the body is well vitrified and the glaze is well
fitting there is normally no problem even putting something from the
refrigerator directly into a heated oven--but prudence says that is
not a smart thing to do and we should certainly recommend people put
our pots into a cool oven.
I might add in some situations unglazed earthenware might be a better
choice than glazed/crazed earthenware for use in regular ovens. There
is more surface area for moisture to escape as the pots heat and so
it can do so with less likelihood of pressure buildup.
Pottery making is one of the most technically challenging of the all
of the craft media. Unfortunately a lot of people do it who have no
interest in learning the basics. And, of course, most beginners make
mistakes along these lines while they are learning--I know I did.
Regards,
John
John Hesselberth
www.frogpondpottery.com
"Man is a tool-using animal....without tools he is nothing, with
tools he is all" .... Thomas Carlyle
Janine LaMaie on tue 29 jan 08
I always mean to bring this up when this discussion arises...
In the past, I used both Cone 6 and 10 B-Mix and of course on one batch of
Cone 6 mugs, I must have used Cone 10 clay for handles. At least that's
all I can think of to blame for a group of mugs whose handles become too
hot to touch after microwave heating. But these are fully glazed (except
bottoms) with a well fitting, non-crazed glaze. Other mugs made at the
same time, with same general form and glazes don't react like this. I
suspect the handles on this flawed batch are not fully mature, but how
could they have absorbed any water? Go figure.
| |
|
