I have a smattering of them, and made beads with them several years ago. Encased, not encased. I check them every 6 months or so to see if there are any cracks, but everything has held up very well.
Lots of the initial information that I had on them indicated that they were not compatible (with 90 coe). I live close to the Thompson factory, and talked to them, and purchased some.
I don't use them often, but I haven't had breakage.
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Lynda
Cheetah, 5 lpm and 7lpm conc/generator (8-9 psi), natural gas (booster), started 11/06
"The time you enjoy wasting is not wasted time." -- Bertrand Russell
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