You may have noticed that we offer glass with two different “COEs” here at Jubilee Creative, COE 90 and COE 96. Ever wondered what the difference is between the two? Well, we have answers.

A COE is shorthand for Coefficient of Expansion, and it refers to the rate at which glass expands and contracts when heated or cooled. COE 90 and COE 96 glass are similar in many ways, and can be used for fusing and kiln-forming with excellent results. It is important to remember, however, to avoid mixing glasses with different coefficients – while COE 90 and COE 96 glasses are all compatibility tested, you can only fuse like with like. A COE 90 piece of glass will not successfully fuse with a COE 96 piece, and you’re more likely to waste time and effort than you are to end up with a usable end product.

Because fusible glass works so well within its own COE but does not necessarily play nice with others, many glass artists and crafters end up choosing to work with one or the other exclusively. But, oh, how to choose? We understand, the struggle is real! On the one hand, COE 96 glass is versatile and forgiving – a boon for new crafters, or those (like yours truly) who occasionally have difficulty getting a nice, even score line. COE 96 is rolled out smoother, which helps many new crafters hone their glass-cutting skills.

On the other hand, all the COLORS! COE 90 has been around for quite a long time, and with time comes a wide and expansive variety of glass colors, textures, and effects. Some artists favor COE 90 specifically for its textured and varied surfaces, which can create excellent effects whether used ‘cold’ or ‘warm’.

Of course, here at Jubilee Creative, we have taken on much of the glass cutting work ourselves — our pre-cut shapes, which range from basic circles to complex, multi-colored pieces, remove a lot of the challenge of working with COE 90 glass.

So in the end, it all comes down to a matter of preference. If you’re still on the fence, we recommend trying out small projects with each type of COE, so you can decide for yourself. No matter what, you can always be confident in one thing – here at Jubilee Creative, whichever COE you choose to use, we carry both COEs made by three different manufacturers, right here in the USA!

Which COE do you prefer?