COE of Czech glass?

Enid Adams · Post by **Enid Adams** » Fri Dec 12, 2003 3:46 pm

I'm new to fusing, and am hoping for some shared wisdom on several types of glass I'd like to fuse to base glass and slump.

Czech glass leaf beads:
I've discovered I don't have the temperament of a serious bead stringer but can visualize my immense collection making some stunning pieces of fused mosaic. Is there a standard COE for this type of pressed glass? And is the surface safe at fusing temps? They are shiny, like an irridescent lustre, and smoother than irridized sheets.

pieces gathered to make hot glass ornaments but never blown:
They may make great magnets to exchange, but I'd also like to try fusing to sheet glass in order to slump.

millifiore murrini:
sold as COE 104 but reds burned out before moretti rod pieces in the same firing showed any signs of softening--I thought they were also 104

I checked the archives and the COE chart but couldn't find these.
Thanks to all who contribute to this great website, and happy holidays.

Brad Walker · Post by **Brad Walker** » Fri Dec 12, 2003 4:08 pm

Most likely the Czech glass varies from batch to batch and type to type and color to color. The only way to know is to test and try it out yourself.

Moretti glass is supposed to be 104, but it's not that consistent across the range. You can have trouble using it for fusing. Again, the only way to know is to test specific glasses that interest you.

As an aside, fusing requires tighter COE tolerances than lampworking/beadmaking, so what works for the torch may not work in the kiln.

Enid Adams · Post by **Enid Adams** » Sat Dec 13, 2003 11:39 am

Thanks, Brad-
Anyone have info on COE for (un)blown ornaments?

Brad Walker · Post by **Brad Walker** » Sat Dec 13, 2003 1:49 pm

Enid Adams wrote:Anyone have info on COE for (un)blown ornaments?

The answer will be the same. It will vary from batch to batch, from supplier to supplier, and probably by phase of the moon and length of hair on the glassblower's head, too.