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Newbe! Frit changes shape of item

For discussion of processes related to using Bullseye glass, including kilnforming and kilncasting, torchwork, blowing and stained glass.

Newbe! Frit changes shape of item

Postby robinpow3 » Tue Jan 22, 2019 5:33 am

Very new to glass fusing! Have watched hours of YouTube and even Googled, but can’t find answer. Right now using a microwave kiln. So far not had any major issues, except when I try use frit. Every time I use it, the base changes shape!

1/2” by 1” 90 coe
Also tried on Bullseyes glass
Capped and un capped

Each time every where there is frit, the base piece shrinks! My rectangle ends up looking like a dog bone.

Frit size is small but not powder.

I know there is a simple answer, but I just can’t find it! Also know the microwave kiln, isn’t ideal. However only days into this new hobby, and trying to get my feet wet. BTW do understand the basic concepts. Did ceramics professionally back 30 years ago.
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Re: Newbe! Frit changes shape of item

Postby Stephen Richard » Tue Jan 22, 2019 2:46 pm

The difference is that a 2 layer piece is much thicker than one plus a layer of frit. It is about volume control. You need as much frit in terms of weight that the single layer of glass to have proper amount of glass.
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Re: Newbe! Frit changes shape of item

Postby robinpow3 » Tue Jan 22, 2019 8:05 pm

That makes sense. Thanks!
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Re: Newbe! Frit changes shape of item

Postby jestersbaubles » Sat Jan 26, 2019 8:33 am

Bullseye has an excellent tech note on volume control: https://www.bullseyeglass.com/images/stories/bullseye/PDF/TechNotes/technotes_05.pdf

Best, Dana
Dana Worley Fused Glass Designs
dba Jester's Baubles
http://www.jestersbaubles.com
http://www.jestersbaubles.blogspot.com
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