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Topic: Bubbles  (Read 479 times)
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heil_kitler
« on: April 20, 2008 04:32:57 PM »

My clay always gets bubbles at the top when I bake it! How do I prevent this from happening?
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HippieKender
The most precious thing one can make is a friend.
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I tend to lick circular things.


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« Reply #1 on: April 21, 2008 08:42:53 AM »

If you have small air bubbles in your clay (that you may not be able to see) they will expand and grow with the heat of curing the clay (to the point that you can see them now). 

Quote from: GlassAttic.com
There are various ways that air or moisture can get into or under clay (especially into sheets) which may show up as bubbles or lumps during pasta machining, or baking
.... air bubbles can show up immediately or not until the clay is heated

Some of the causes have to do with:
the way the clay is conditioned or trapped clay under pasta machine scrapers pulling on sheets, particular type of clay or soft stretchy clay, particular type of box or bar of clay you happen to get, covering or layering clay sheets trapping air, not letting clay rest before baking, moisture from hands or white glues creating steam bubbles, etc.... here are just a couple of suggestions:
...running your clay through the pasta machine at progressively thinner settings (without folding) can help avoid, or get rid of, bubbles. LynnDel
...letting clay rest before baking can help make internal bubbles go away for some reason
...leaching the clay may help
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Diane B.
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GlassAttic --polymer clay "encyclopedia"


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« Reply #2 on: April 21, 2008 08:59:36 AM »

The quote below has a summary of the main reasons that bubbles may happen in polymer clay, but here's the page at my site that gives loads more details on each of the reasons plus even more ways to avoid them, if you want to check it out:
http://www.glassattic.com/polymer/pastamachines.htm
(...click on Bubbles...)


HTH!

Diane B.
« Last Edit: April 21, 2008 09:03:06 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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