Odd crack - WarmGlass.com

Odd crack

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Aglassygirl303
Posts: 47
Joined: Sun Nov 08, 2009 10:08 pm

Odd crack

Postby Aglassygirl303 » Mon Dec 08, 2014 7:53 pm

There is a crack that is only on the top layer of my 14" platter. It is healed and soft. Not through the second layer. It also did not crack through the design on the piece. Why would this occur. It is. Small squiggle shape. Not n S or a c shape. It appears that it cracked and then fused together but it is visible. Can it be fixed and how. Also anyone gues as to why?

David Jenkins
Posts: 174
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Location: Cypress, Texas

Re: Odd crack

Postby David Jenkins » Mon Dec 08, 2014 8:06 pm

Can you post a picture?
Dave Jenkins
Glass at Harbor Gates
Cypress, TX

Aglassygirl303
Posts: 47
Joined: Sun Nov 08, 2009 10:08 pm

Re: Odd crack

Postby Aglassygirl303 » Mon Dec 08, 2014 8:36 pm

I have been trying to upload a pic. How do I do that. Help

Stephen Richard
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Re: Odd crack

Postby Stephen Richard » Tue Dec 09, 2014 6:16 pm

Sounds to me like too rapid heating on the rise. The glass may have softened at edges and strain became too much for the top layer so splitting.
Steve Richard
You can view my Blog at: http://verrier-glass.blogspot.com/

Aglassygirl303
Posts: 47
Joined: Sun Nov 08, 2009 10:08 pm

Re: Odd crack

Postby Aglassygirl303 » Wed Dec 10, 2014 2:16 pm

I think your correct and this happenned on a piece a while back. It actually had a large crack on the top layer with soft edges. Very cool looking actually, I put it in my gallery and it actually sold quickly!

For this piece I did go faster, I began at 450 dph and that is a schedule I use for small pieces. This is a larger 13" platter with a few design elements. A tack/ contour fuse. I did another at 200dph and a 3 hr anneal. Hope to open the kiln and find a good piece.

Thank you for the input

Buttercup
Posts: 555
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Location: S.E. Queensland Australia

Re: Odd crack

Postby Buttercup » Fri Dec 12, 2014 11:10 pm

Don't know but curious....would the piece with the large crack that sold quickly possibly have been subjected to some annealing issues and may be in danger of causing a spontaneous ( or not so spontaneous if it's built in) break in its future? Have no idea but am curious to know if it's at risk or would the fact that it cracked have alleviated the stress? Jen

Bert Weiss
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Re: Odd crack

Postby Bert Weiss » Sun Dec 14, 2014 12:53 pm

I agree with Stephen. It cracked during the heatup, opened when it got hotter, and healed in the big heat. Slow down your initial heatup. The piece is now structurally sound, assuming a good anneal cycle happened. Visually, is your call...
Bert

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