Near and mid infrared glass, with a transmission band of 0.37-5 μm, and the refractive index (nd) ranging from 1.52 to 1.99. Its glass system includes the silicate system, the germanate system, the calcium aluminate system and the lead germanate system, etc.
| Type | n4 | υ4 | n3-n5 | Tg(℃) | ρ(g/cm3) | 透過波段(μm) |
| IRG102 | 1.6226 | 14.76 | 0.0422 | 754 | 3.10 | 0.4~5.5 |
| IRG105 | 1.8541 | 18.92 | 0.0452 | 552 | 5.62 | 0.5~5.5 |


