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Tips, Techniques, and Questions -- Technical questions or tips |
2013-03-03, 9:42am
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honorary bead lady
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Join Date: Jan 14, 2008
Location: Mostly the doghouse
Posts: 5,180
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COE Does Not Equal Compatibility
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2013-03-03, 10:06am
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Formerly FishBulb
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Join Date: Dec 05, 2008
Location: Pony Flower Princess Land
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Excellent article. Thank you for posting it.
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2013-03-03, 12:00pm
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Run Free Sweet Boy
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Join Date: Jan 29, 2008
Location: Orlando, Fl.
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have not read it, but the statement is correct.
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2013-03-03, 4:15pm
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Senior Member
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Join Date: Feb 15, 2006
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Thanks David for posting the link.
Janet
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2013-03-03, 10:59pm
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one day at a time
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Join Date: Jun 27, 2005
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Thanks! I have wondered about viscosity of different glasses in the same bead, from day 1 of my beadmaking career. It always did make me a little nervous.
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2013-03-04, 11:20am
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Senior Member
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Join Date: Mar 07, 2011
Location: Northern California
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Unfortunately no one reports on viscosity so COE is the only measure from the manufacturer that the consumer has. As such viscosity may also vary batch to batch without the consumer knowing until it is too late.
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2013-03-04, 3:15pm
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Color Outside The Lines!
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Join Date: Sep 08, 2005
Location: Charlottesville, VA
Posts: 195
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Compatibility
We use strain polarimetry to determine compatibility parameters and fit. We test against a single, repeatable, (though somewhat arbitrary) constant, a certain batch of Effetre 004 clear. The fit testing process gives us strain in PSI, which is a fairly accurate and specific measure of compatibility, and allows us to adjust each batch, if necessary, to more closely approach the prefered "zero".
Is it 104? I don't really know. Dilatometric testing is often only accurate to +/- 2 coe points, which is a margin of error way outside of our in-house testing parameters, in addition to being somewhat irrelevant in light of the aforementioned viscosity, annealing point, and strain point issues.
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2013-03-04, 4:19pm
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Senior Member
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Join Date: Sep 01, 2012
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What happens when you run out of the one specific batch?
I have not had any issues with double helix glass. Just curious as it is arbitrary anyways.
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2013-03-04, 4:28pm
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Color Outside The Lines!
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Join Date: Sep 08, 2005
Location: Charlottesville, VA
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When we get low, we go to Frantz Art Glass, and take samples of all the bundles of 5mm clear in the building. Then we run polarimetric testing on the "new" clear vs the "old" clear until we find one that yields "zero" PSI, and buy the 10 kilo bundles that yielded zero PSI strain.
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2013-03-05, 5:20am
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Run Free Sweet Boy
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Join Date: Jan 29, 2008
Location: Orlando, Fl.
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an example in real life for me of COE not meaning compatible... I learned soft glass blown work from Jean Boutz using 90 coe tubing. All his colors came out of europe and were tested over a period of years. when I started doing glass about 35 years ago, most of his color stash was already 20 or more years old.
the 90s coe tubing is very soft and drippy stuff, it is lead based. I have been trying and testing a lot of the bullseye 90 coe rod, much of that is rather stiff, and it does not work in my application. Some of the very soft and runny colors do work.
then you add in the added factor of wanting to use more than one color on a thinly blown piece and you have to test all over again.
I really wish I could find some soft 90 coe color rod, or some standard wall 104 tubing.. the 104 tubing I can find is bloody expensive and hand pulled and VERY thin.. then its test all that glass and color as well....
I really want to keep alive the tradition of the blown work I learned, but getting compatible glasses is not an easy thing.
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NEW FLAMINGO BEACH BEAD TUTORIAL AVAILABLE NOW.CHRISTMAS ORNAMENT AND ICICLE TUTORIAL, VISIT MY ETSY SHOP AT To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
"It's not what you have, it's who you are."
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2013-03-05, 7:09am
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I fart diamonds
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Join Date: Jun 14, 2005
Location: Altamonte Springs, FL
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Quote:
Originally Posted by patienthand
an example in real life for me of COE not meaning compatible... I learned soft glass blown work from Jean Boutz using 90 coe tubing. All his colors came out of europe and were tested over a period of years. when I started doing glass about 35 years ago, most of his color stash was already 20 or more years old.
the 90s coe tubing is very soft and drippy stuff, it is lead based. I have been trying and testing a lot of the bullseye 90 coe rod, much of that is rather stiff, and it does not work in my application. Some of the very soft and runny colors do work.
then you add in the added factor of wanting to use more than one color on a thinly blown piece and you have to test all over again.
I really wish I could find some soft 90 coe color rod, or some standard wall 104 tubing.. the 104 tubing I can find is bloody expensive and hand pulled and VERY thin.. then its test all that glass and color as well....
I really want to keep alive the tradition of the blown work I learned, but getting compatible glasses is not an easy thing.
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Have you tried the chandelier glass the Arrow Springs has for $5/lb? It's 104 with 2mm wall. I've thought about ordering some, but never got around to it.
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