FYI
https://www.corning.com/microsites/csm/gorillaglass/PI_Sheets/Corning_Gorilla_Glass_6_PI_Sheet.pdf
Flexible glass is a legendary
lost invention from the time of the reign of the
Roman Emperor Tiberius Caesar (between 14–37 AD). As recounted by
Isidore of Seville, the craftsman who invented the technique brought a drinking bowl made of flexible glass before Caesar who tried to break it, whereupon the material
dented, rather than
shattering. The inventor then repaired the bowl easily with a small
hammer. After the inventor swore to the Emperor that he alone knew the technique of manufacture, Tiberius had the man
beheaded, fearing such material could undermine the value of
gold and
silver.
[1][2]
The story of the sad fate of the inventor of
unbreakable glass (vitrum flexile) at the hands of
Tiberius (42 BC – 37 AD) was first related by two more-or-less contemporary compilers, namely
Petronius (c. 27–66 AD,
Satyricon 51) and
Pliny the Elder (23–79 AD, Naturalis Historia XXXVI.lxvi.195).
