For windows,domes and lenses for thermal-imaging system.
CVD ZnS, which appears orange, mainly works in Far-infrared region
Multi-spectrum ZnS (M-ZnS) shows excellent optical properties across the full band of 0.4-12μm, can be used in Far-, Mid-, Near-infrared and visible regions.
CVD ZnS windows, lenses and domes with size up to Ø250×16mm. For M-ZnS, the maximum size is 300×200×15mm
Main Properties
| Appellation | Standard CVD ZnS | Multi-Spectral ZnS |
| Homogeneity of refractive index | <3×10-5 @0.6328μm | <3×10-5 @0.6328μm |
| Hardness(knoop)(kg/mm2) | 210-230 | 160 |
| Rupture modulus(Mpa) | 103.4 | 68 |
| Young's Modulus(GPa) | 74.5 | 74.5 |
| Posson ratio | 0.29 | 0.28 |
| Melting point (℃) | 1830 | 1830 |
| Density, (g/cm3) | 4.09 | 4.09 |
| Thermal conductivity(W/cm.K) | 0．19 | 0.272 |
| Thermal expansion coefficient, (10-6 ，℃-1 ) | 7.85 | 7.85 |
| Specific heat (Cal/g.k.) | 0.112 | 0.124 |
| Dielectric constant | 8.35 | 8.35 |