| Model | ST-1 | ST-2 | ST-3 |
| Purity | 99.5% min | 99% min | 99% min |
| BaO | 0.01% max | 0.1% max | 0.3% max |
| Fe2O3 | 0.01% max | 0.1% max | 0.1% max |
| K2O+Na2O | 0.01% max | 0.1% max | 0.1% max |
| Al2O3 | 0.01% max | 0.1% max | 0.1% max |
| SiO2 | 0.1% max | 0.1% max | 0.5% max |
| Lead Tungstate | Cesium Tungstate | Calcium Tungstate |
| Barium Tungstate | Zirconium Tungstate |
| Cerium Vanadate | Calcium Vanadate | Strontium Vanadate |
| Lead Stannate | Copper Stannate |