Glass didn’t slump

[artsyannie]

I tried slumping for the first time and it didn’t slump into the mold.  I have a Paragon Firefly kiln, a two layer (~1/4″) piece of glass (previously fused to make blank) and used the following schedule:

Segment/Rate/Target temp/Hold (obtained from this website)

1/200/900/15 min

2/100/1175/0 min.

3/Full/960/45 min.

4/100/800/0 min.

5/200/700/0 min.

6/400/100/0 min.

Any suggestions??

Thanks, Anna

[Stephen Richard]

possible reasons:

Too low a temperature for the size of the mould.

Too short a soak (i.e. none) at the top temperature.

Your top temperature is at the low end of slumping temperatures, so you need a long soak.  The smaller the mould, the greater the time it takes for the glass to slump – weight and gravity apply.  As I don’t know the size of the mould or its shape, nor the size or configuration of your kiln, I can’t really be more specific.

I do have a range of suggestions in my blog, though. use “slumping” for the tag.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

[artsyannie]

Thanks for your reply. I will check out your blogs.  For reference, the glass blank is 2″ X 3″ and the mold is the same size rectangle obviously and the depth is about 5/8″.  The interior space in the kiln is 8″x8″x4.5″.

[Stephen Richard]

Yes, definately not enough heat and time.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

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