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Topic: Sculpey flexible after being baked  (Read 637 times)
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classifiedomega17
« on: June 04, 2008 01:06:28 PM »

I'm really sorry if this has been asked before. I couldn't really find anything in the archives that helped.

I made a couple of flat, thin figurines which I intended to put onto a necklace. I baked them and took them out when they were still sort of flexible but did not move far from their intended shape (also, they had been in the oven for over 30 min and the package said 30 min for ever 1/4 inch and they are pretty thin). I let them cool, but they are still sort of rubbery. They don't break when you bend them (although I imagine they would break if you bent them too much) but they weren't as solid as I would like them to be. I hadn't used glaze before and I had to pain them so I went ahead and painted and glazed them in the hopes that would stiffen them up. It didn't.

So, my question is, do I stick them back in the oven and hope for the best? Or will there be toxic fumes? And why did it get rubbery in the first place?


Thanks for the help.
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Diane B.
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GlassAttic --polymer clay "encyclopedia"


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« Reply #1 on: June 05, 2008 10:37:18 AM »

Hi,

The flexibility after baking in thin items you experienced is normal for most brands of polymer clay, but should have been less true for the 3 main Sculpeys so it's possible that you did underbake your clay.  Sculpey, SuperSculpey and Sculpey III are the stiffest brands of polymer clay after baking, but they sacrifice strength for that stiffness and should have broken if you'd bent them after cooling.

Were you using an oven thermometer next to the clay in the oven?  If not, that is one essential item for curing polymer clay because many ovens don't actually heat to the temp set on their dials, and/or ovens often have hot spots (ovens also must be preheated before putting clay inside).

You can read all about the flexibility issue, and how to deal with it, on this page at my site:
http://www.glassattic.com/polymer/Characteristics.htm
(...click on the category called Strength---Flexibility, Rigidity near the top of the list...)


Quote
Or will there be toxic fumes? 


There will be no toxic fumes as long as you don't burn the clay (which happens at around 385 F, producing black smoke and a horrible stink). 
Check out these pages for loads of info on how to bake polymer clays successfully, and info on the safety of clay from fumes, etc:
http://www.glassattic.com/polymer/baking.htm
http://www.glassattic.com/polymer/safety_health_cleaning.htm



HTH,

Diane B.



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http://glassattic.com/polymer/contents.htm
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Noadi
« Reply #2 on: June 09, 2008 02:22:21 PM »

If you used Premo Sculpey that clay is quite flexible for thin items once it's baked.  It's really an advantage when you think about it, lets the clay take a little more punishment than it would if it couldn't bend a little bit.
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ilysa
« Reply #3 on: June 15, 2008 04:28:17 AM »

All of the brands of polymer clay have some flexibility after baking and are not easily broken unless of course you bend them in half or are using Sculpey.LOL
I would not put a glaze back in the oven but you can use Future floor wax and put that back in the oven for a nice shine. Good luck!
Regards,
Ilysa

« Last Edit: March 02, 2012 03:26:57 PM by jungrrl » THIS ROCKS   Logged

Diane B.
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GlassAttic --polymer clay "encyclopedia"


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« Reply #4 on: June 15, 2008 09:51:41 AM »

The degree of flexibility after baking in thin areas of polymer clay has changed some with all the new formulations of polymer clay that are happening these days, but the general rule is still that all of them will be flexible (though the strength and tearability can vary between brands and lines somewhat) except for the main 3 Sculpeys (Sculpey , SuperSculpey and Sculpey III)--those will be less flexible and more breakable.

Btw, it's fine to reheat gloss Varathane and many other acrylic finishes as well as Future but it's generally always done for a short time (5-15 min) at 200-250. I'm not sure how the dimensional-glue finishes or even thinned white glue would work when heated, but I'd bet they'd be fine too because of their composition.


Diane B.
« Last Edit: June 15, 2008 09:52:33 AM by Diane B. » THIS ROCKS   Logged

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)
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