| ZFx | MedX | LX-57B | |
Lead equivalent [mmPb] | <1.5 | |||
Main component [Wt%] | Lead oxide (II) PbO | >55 | <48 | 55 |
Silicon oxide SiO | <50 | (37) | (37) | |
Potassium oxide K2O | <10 | - | - | |
Barium oxide BaO | - | <15 | 5 | |
Others | Arsenic oxide < 5 | Arsenic trioxide < 0.5 | Boron oxide 3 | |
Refractive index | 1.71 | 1.76 | 1.71 | |
Knoop hardness [kg/mm2] | 370 | 440 | 370 | |
Density [g/cm3] | 4.46 | 4.8 | <4.36 | |
Transmittance [%] (wavelength 550 nm) | 86 | <85.0 | 88 |