Glass A has a composition of 90% SiO2 - 10% Na2O. Glass B has a composition of 99% SiO2 - 1% Na2O. Both glasses are cooled to room temperature at the same rate.

Question

(a) Which glass has the higher Tg?

Glass A
Glass B
(b) Which glass has the lower free volume?

Answer 1

A) glass B
B) glass A

Answer 2

Thanks!

Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO