Is 90 coe glass thinner than other glasses? Anyone know?

[bustierde]

I have a BUNCH of unlabeled glass. It could be 104, or 96, or 90 and I will be doing small tests to check for compatibility.  But someone said that 90 is thinner than 96, and I was wondering..is that fact or fiction?

Thanks!

[HSG]

I do not believe that it is thinner on the whole. But one of our fusers will come along and let us know if I am wrong.

[CrazyEyeGlass]

It's not thinner, it's a harder glass. The higher the COE the softer the glass.

[speedingpullet]

I don't know about thinner.... but in my experience 90 tends to be more hand-rolled looking and 96 more machine-rolled looking. The 90 I get - bullseye, ouroboros etc.. tends to have wavy edges on the edge of the sheet and a slightly dimpled appearance. Whereas the 96 tends to have the mirror-smooth surface of the glass you see in picture frames, and a sharp edge to the sheet. The color in the 96 tends to be more evenly spread and uniform - even the marbled glass is more uniformly patterned.

Obviously, there is hand-rolled 96 and machine-rolled 90, so you'll need to test it all against each other.
But I'm in a class where half of us use 90 and the other half use 96, so have seen the two types side-by-side enough times to hazard a guess.

As for 104, I've rarely seen it in sheet form - it almost always comes in rods or ribbons due to its use in lamp work.

Hope this helps!

[Glassables]

I can't give a double confirmation on speedingpullet's 90 v 96, unfortunately.

I can definitely confirm that I've never heard of a sheet of 90 being specifically thinner than another type of glass though.

And good luck, I hope pullet is right! And even then, I hope your test comes out conclusive! When it's in tube form for flameworking, the only way people in my studio can even attempt to tell soft from boro is the tint of green or blue at the end of the tube!