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Topic: Polymer Clay baking/curing time question  (Read 1125 times)
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yellowduckie
« on: December 21, 2004 09:16:49 AM »

When instructions call for baking/curing times, when is the clay put in the oven (I'm using a toaster oven).  Does the oven get pre-heated, or does the bake time include the oven heating up?
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booglass
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« Reply #1 on: December 21, 2004 09:31:40 AM »

I preheat since a consistent tempature is probably best.  But I am no expert. 
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Honeybee74
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« Reply #2 on: May 11, 2005 03:22:51 PM »

well, i use a toaster oven too, and i have found that if you have a semi-tall peice make sure you watch him/her because i've had a couple of smoking and then on fire little heads.  No Fun.  Definitly PreHeat. Also, i have a special pan that goes in, but if you put some tinfoil underneath them it keeps them from sticking or making a mess on the pan (just be careful b/c it could cause it to overheat as well). 

Honestly i have found that it is best to keep an eye out, it takes some time to figure out your perfect times/heats for your specific toaster.

Did that help at all?  Huh Sorry if it didn't.
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pixie_stixs
« Reply #3 on: May 12, 2005 06:11:25 AM »

I've never used a toaster oven...but I usually let the oven preheat for about 30 minutes to makes sure it's an even heat. I also use a glass container to bake them in.
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Honeybee74
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« Reply #4 on: May 12, 2005 09:53:42 AM »

i never even thought of using a glass container, but i bet that works really well. i'll have to try that!
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pixie_stixs
« Reply #5 on: May 12, 2005 04:39:11 PM »

Yeah the glass container works good...I read it in a book that was far too expensive to buy...but i did browse  Grin
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Diane B.
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GlassAttic --polymer clay "encyclopedia"


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« Reply #6 on: May 13, 2005 04:59:49 PM »

Definitely pre-heat ... and it's essential to buy an oven thermometer no matter what type of oven you're using (just a cheapie $5 one from the grocery store is fine). Some people have found that even expensive ovens (regular, toaster, or convection) won't necessarily heat to the temp indicated on the dial, or can have hot spots in various places inside, etc.. 

Many polymer clays (especiallly lighter color ones, and any with translucent in their make up) will darken over certain baking temps... those temps vary with the brands, and sometimes even with specific colors (the Sculpeys are the worst).
All these things are more critical in smaller toaster ovens, especially with tall items or those with sticking-out, thin parts. 

There are various ways to moderate the temp, protect the clay, and otherwise avoid darkening (or actual burning  Shocked) when baking polymer clay though.  It can even be baked completely enclosed in a box made from two alum. roasting pans (or under an oven-safe bowl), etc.... in those cases though, more baking time is required to fully reach and bake the clay.

There's loads of info on how to bake polymer clay on this page of my website if anyone wants more details on any of this and more:
http://www.glassattic.com/polymer/baking.htm


HTH,


Diane B.
http://www.glassattic.com ....polymer clay "encyclopedia"
Table of Contents: http://www.glassattic.com/polymer/contents.htm
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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)
Diane B.
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« Reply #7 on: May 13, 2005 05:09:02 PM »

Oh, and I forgot to mention something else ...about the glass. 

Any surface that's shiny or really smooth (metal, ceramic, glass, etc.) will cause any clay that's touching it during the baking process to become shiny.  So if you don't want to have shiny spots on your otherwise matte surface clay, or if the shiny place won't be on the bottom of something where it may not matter as much, then just put a sheet of ordinary paper on top of your shiny surface.  Paper has almost exactly the same texture as ordinary baked clay.

What's happening is that polymer clays will soften slightly when heated (and can even slump if any part if gravity-challenged and not propped), so it  will take on the texture of whatever it's baked on. 

Also, anything that heats up easily, like metal, can heat up more than the ambient air temp or hold heat too well, and possibly darken or burn the bottom of an baking object.  If that happens in a particular oven, solutions can be using a larger oven, raising the shelf away from the coils, or elevating the metal with something more heat tolerant (like maybe a small block of wood, or even a few long rolls of aluminum foil as legs), or using something less conductive to begin with.



Diane B.
http://www.glassattic.com ....polymer clay "encyclopedia"
Table of Contents: http://www.glassattic.com/polymer/contents.htm
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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)
carlierae26
« Reply #8 on: May 13, 2005 09:55:52 PM »

also.. cover (tent) the item with foil.. shiney side out
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