Analyzed Glass Compositions for Ancient and Modern Glass Containers, Showing Similar Ratios from 1500 BC to Modern Times
| Weight % | Egypt 1500 BC (10) | Roman 1st Century AD (11) | Window Glass 8th–9th Century (12–13) | Naples 17th Century (12–13) | Beverage Bottle 2013 (14) |
|---|---|---|---|---|---|
| SiO2 | 68 | 69 | 70 | 69 | 73 |
| Al2O3 | 3 | 4 | 2 | 1 | 1 |
| B2O3 | |||||
| Na2O | 16 | 19 | 15 | 17 | 12 |
| K2O | 2 | <1 | 1 | 3 | <1 |
| MgO | 3 | 1 | 1 | 2 | 2 |
| CaO | 4 | 7 | 6 | 9 | 11 |
| Fe2O3 | 1 | 1 | 1 | <1 | <1 |