[Stoves] Glass stove parts

[Jigme Rangdrol]

While looking for the EC of plate glass today I found this...

Schott, [Schott Robax]"the makers of Zerodur, also makes a sheet glass-ceramic with an expansion coefficient
of "0.0, +/-0.3 x 10^-6/degree C".  It has that tell-tale yellow tint
when you look through the edge, and happens to be dirt cheap" 

Does anyone have experience with this glass or know of its composition?