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from wikipedia
The composition of both Corning 7740 and Schott 8830 is given as 80.6% SiO2, 12.6% B2O3, 4.2% Na2O, 2.2%Al2O3, 0.04% Fe2O3, 0.1% CaO, 0.05% MgO, and 0.1% Cl.
Sort of makes sense as glass ~= sand ~= silicon oxide = Si02 (?)
blodgett was thinking more along the lines that if one attempted to inhale a pie dish, less than half of it would get in the way!
from wikipedia
The composition of both Corning 7740 and Schott 8830 is given as 80.6% SiO2, 12.6% B2O3, 4.2% Na2O, 2.2%Al2O3, 0.04% Fe2O3, 0.1% CaO, 0.05% MgO, and 0.1% Cl.
blodgett declares these comments to be far too informative