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Tips, Techniques, and Questions -- Technical questions or tips |
2008-06-18, 10:11am
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Senior Member
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Join Date: Mar 07, 2006
Location: Tehachapi, CA
Posts: 2,032
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Does some glass crack easier than others?
I made some of the beads that have transparent glass on one half and ivory on the other. The beach/ocean look. Anyway, I often get cracks along the hole on the transparent glass. This was vetro aqua. It seems to me that the transparent cracks more easily than the opaque. Now I am batch annealing, and this crack developed after I took the bead off the mandrel, before it was annealed.
So my question is this: Is some COE 104 glass more susceptible to thermal cracks than others?
Thanks!
Cheryl
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2008-06-18, 10:12am
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Gay rights R human rights
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Join Date: May 06, 2006
Location: Squamish BC Canada
Posts: 2,719
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Some dont hold the heat as well as others.....and therefore cool faster.
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Leslie
"Very funny, Scotty. Now beam down my clothes."
Remember kiddies..."WRAP IT BEFORE YOU NAP IT!!!!
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2008-06-20, 7:43am
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Glassy Lady
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Join Date: Jun 05, 2005
Location: San Francisco Bay Area
Posts: 2,905
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Yes. I have made a lot of beads like that and I've found that the transparent blues and aquamarines are more prone to thermal cracking. The darker the color the worse it is. I never use cobalt on these beads any more, it always cracks. The other colors are ok as long as I put the beads directly into the kiln, as opposed to batch annealing.
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Alex Mironov
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BHB/PANDORA EXCHANGE IN THE PATIO
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2008-06-20, 11:33am
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Senior Member
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Join Date: May 21, 2006
Location: Cincinnati
Posts: 2,807
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Anybody know why they don't hold heat as well????
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Lynda
Cheetah, 5 lpm and 7lpm conc/generator (8-9 psi), natural gas (booster), started 11/06
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