Table 4 Chemical composition of raw materials used for model glass preparation (XRF, in wt %)
From: Modeling of Bohemian and Moravian glass recipes from Gothic to Baroque periods
Quartz | Pure sand | Beech ash | Laboratory- prepared potash | Industrially prepared potash | Limestone | |
|---|---|---|---|---|---|---|
SiO2 | 98.9 | 98.7 | 1.9 | 1.2 | 0.02 | 2.8 |
Al2O3 | 0.6 | 1.1 | 0.6 | 0.04 | 1.5 | |
CaO | 0.1 | 0.04 | 35.0 | 0.3 | 0.01 | 51.5 |
K2O | 0.2 | – | 14.8 | 50.1 | 56.5 | 0.3 |
Na2O | 0.1 | – | 0.1 | 0.8 | 0.1 | – |
MgO | 0.02 | – | 6.3 | 0.08 | 1.5 | |
MnO | – | – | 2.7 | – | 0.03 | |
Fe2O3 | 0.1 | 0.03 | 0.4 | – | 0.3 | |
P2O5 | 0.02 | – | 2.6 | 0.2 | 0.02 | |
TiO2 | 0.01 | 0.05 | 0.04 | – | 0.05 | |
BaO | – | – | 0.4 | – | – | |
SO3 | – | – | 1.5 | 6.8 | – | |
Cl | – | – | 0.06 | 0.2 | <0.01 | |
Rb2O | – | – | 0.04 | 0.1 | – | |
SrO | – | – | 0.1 | – | 0.02 | |
CO2 | – | 0.06 | 33.5 | 40.3 | 43.3 | 42.0 |