Coe 90 & 104
 

Hello,
I am wondering if anyone has experience with making a bead with COE 90 and COE 104 (Moretti and Bullseye) together? Bullseye has a few really nice simple and pure colors I would like to apply to some of my Moretti base designs.

Thanks!

Mickey \\:D/

It won't work, the bead will crack and be unusable is the wisdom I have always heard. They are too different. You can use a certain amount of 96 frit (leaded being safest) on a 104 bead, but not 90 is what I have heard, but not tried.

I tried it just to see and it was a terrible failure. Cracked apart in the kiln.

Thanks to you both! Saved me some money and time!!!!

I just came from Christmas at BF's mom's. They got me a bunch of tools and glass from Devardi. As I'm opening stuff, there's all these slips of paper warning not to mix COEs and they even wrote it with a Sharpie on the paper wrapping of the 104 rods. I thought it was weird until I opened the other stuff which was COE 90 little square pieces for fusing. (Which I don't do)
I appreciate Devardi for watching out for me!

what a nice gift, Bea.
Mickey, nothing wrong with trying to grab some of those gorgeous colors but alas, we have to make do. :)
I love seeing all these new glass peeps here, please come over to the gallery if you want and post some pics & chat. We love seeing new folks

Happy Holidays!

I'll second everyones advice, and say its not possible to mix 104 and 90 - they're too far apart expansion-wise and everything you make with them together will be incompatible and will crack.

90COE is notoriously fussy, even within the COE range.
Some reds/yellow/oranges (cadmium rich) will crack even when used with compatible 90COE glass. Even 96COE (used also for fusing and mainly for stained glass and glassblowing) is incompatible with 90 - so you can imagine how badly it will go when you add soft soda lime to the mix!

Either do everything in 104, or everything in 90.
By all means you can glue/attach one piece to another after they've both been annealed/fused etc - but use heat to join them together and you'll have an unhappy, cracked mess :-(