Comment by defrost

There's more to glass than simple silica soda lime formulations.

Glass chemistry is still a dark arcane art on the fringes with discoveries made all the time.

I'm not suggesting either of these are better suited or even equivalent insulaters but they are more flexible than what many think of as glass:

https://cen.acs.org/materials/inorganic-chemistry/glass-isnt...

https://www.corning.com/au/en/innovation/the-glass-age/desig...