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Topic: So is there a reason why my owl decided he wanted to look like a planet?  (Read 3450 times)
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PuNkY*BrAtZtEr
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« Reply #20 on: July 19, 2006 12:13:19 AM »

I might have missed it while I was reading the posts, but I was curious what you are baking your clay on? I used metal once and this happened, and since I've used glass pie plate I've never had ANY problem, and my sibilings and I make some pretty tiny and thin items and we always bake them at 275, but then again it varies with the ovens... Just thought I'd put my two cents in. Cheesy
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Diane B.
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« Reply #21 on: July 19, 2006 10:02:08 AM »

Quote
I used metal once and this happened, and since I've used glass pie plate I've never had ANY problem,

I don't understand the physics involved, but unfortunately both metal trays and ceramic tiles can heat up higher than the ambient temp of the air in an oven, so those can be more probelmatic for baking clay (especially when the items are thin or small). 

Just putting a piece or two of plain paper between the clay and those baking surfaces  is usually enough though to avoid that, or else the whole metal baking tray or ceramic tile can be elevated farther away from the bottom coils with a couple of alum. foil logs or wood strips.  Ah, minutiae  Roll Eyes... but good to know if it's messing you up.



Diane B.
GlassAttic....polymer clay "encyclopedia" http://glassattic.com/polymer/contents.htm
little bit'o photosharing: http://pg.photos.yahoo.com/ph/dianeatglassattic/my_photos
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POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
PuNkY*BrAtZtEr
professional shooter/natural born brat
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who says wings aren't an accessory?


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« Reply #22 on: July 19, 2006 02:54:10 PM »

Quote
I used metal once and this happened, and since I've used glass pie plate I've never had ANY problem,

I don't understand the physics involved, but unfortunately both metal trays and ceramic tiles can heat up higher than the ambient temp of the air in an oven, so those can be more probelmatic for baking clay (especially when the items are thin or small). 
yea I know that's true about metal, but I've never used ceramic... never thought of that.
I just use plain old clear glass oven safe plate. Cheesy
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TAddictedAngelT
« Reply #23 on: July 19, 2006 04:51:02 PM »

I used the metal tray that comes with the oven with a piece of foil between it. i

i wasn't aware you could put paper in the oven. doens't it burn?
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teapotdnky
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« Reply #24 on: July 19, 2006 04:58:38 PM »

If your oven is set at the right temp for the paper it won't burn. Over time it will get brittle and brown and needs to be changed though.

EDIT: I wrote clay, I meant paper.
« Last Edit: July 19, 2006 05:54:35 PM by teapotdnky » THIS ROCKS   Logged

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Diane B.
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« Reply #25 on: July 19, 2006 05:32:41 PM »

There's a famous Ray Bradbury book that makes it easy to remember the burning temperature of paper (in this case, re burning books)... it's called "Fahrenheit 451".  It seems strange that paper has such a high burning point, I know, but it's just wood after all and home ovens don't get nearly as hot as direct flames (and polymer is baked in a "low" oven anyway). 

I use a sheet of two paper all the time on my metal baking tray, and it lasts a long time (except that I'm often using the paper --often "patty paper"-- as something to make and  carry the clay on so I won't have to distub it on the way to and from the oven, so I guess it doesn't stay in there for a hugely long time anyway).  After awhile some of the plasticizer from the clay will get onto the paper, and I believe that's what can darken from long-term direct contact with metal, etc.... not sure though (plasticizer burns at over 385 degrees).

Quote
I used the metal tray that comes with the oven with a piece of foil between it.

Foil between the tray and the clay??   Aluminum foil is thinner than a metal baking tray so I assume it would dissipate some of the heat from the baking tray if over it, but you'll also get a shiny spot anywhere the clay touches any kind of metal (or glass, ceramic, etc.) while it's baking.  So you could always put a piece of paper over the foil if you wanted, or there are lots of other things that can insulate the clay from the metal or ceramic too and not leave a shiny spot, like a bit of polyester fiberfill (don't worry, it doesn't burn/melt either unless it's almost touching the heating coils), or a wad of tissues (more "wood"), or a wad of cotton fabric, or a even pile of baking soda, etc.


(check out this page for lots of baking info:
http://www.glassattic.com/polymer/baking.htm )




Diane B.
GlassAttic....polymer clay "encyclopedia" http://glassattic.com/polymer/contents.htm
little bit'o photosharing: http://pg.photos.yahoo.com/ph/dianeatglassattic/my_photos


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POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
wanching
« Reply #26 on: July 19, 2006 11:12:04 PM »

cute!
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