Zinc Sulphide (ZnS)

Zinc Sulphide 1

Zinc Sulfide (ZnS) is a valuable material in optics, especially noted for its broad transparency range from the visible to the infrared spectrum. This makes it ideal for use in multispectral applications, such as imaging systems and IR optics. ZnS is often used in lenses, windows, and domes for military and aerospace applications due to its excellent optical properties and good mechanical strength. Additionally, it can be manufactured in both cubic (clear) and hexagonal (multispectral) forms, offering versatility for various optical requirements. ZnS’s ability to withstand harsh environments and high durability further enhance its suitability for demanding optical applications.

Optical PropertiesIR GradeMultispectral Grade
Refractive Index Inhomogeneity @ 0.6328μm< 100 x 10-6< 20 x 10-6
Thermal co-efficient of Refractive Index @ 10.6μm4.1 x 10-5/°C5.4 x 10-5/°C
Bulk Absorption Coefficient @ 10.6μm≤ 0.24 /cm≤ 0.20 /cm
Thermal Properties
Thermal Linear Expansion6.8 x 10-6 /°C
@ 20°C
6.5 x 10-6 /°C
@ 20°C
Thermal Conductivity0.167W/cm/°C
@ 20°C 
0.27W/cm/°C
@ 20°C 
Specific Heat0.469 J/g/°C0.527 J/g/°C
Mechanical Properties
Density4.08 g/cc4.09 g/cc
Knoop Hardness210-240 kg/mm²150-160 kg/mm²
Young Modulus74.5GPa  85.5 Gpa
Poisson’s Ratio0.270.27
Rupture Modulus103.4 MPa68.9 Mpa
Fracture Toughness0.8 x 10⁶ N/m3/21.0 x 10⁶ N/m3/2
λ (μm)IR Grade Indexλ (μm)Multispectral Index
0.422.5160.402.5451
0.502.4190.502.4127
0.622.3550.642.3473
0.702.3320.702.3307
0.822.3100.852.3065
0.902.3010.892.3018
1.002.2921.012.2916
2.202.2632.052.2644
3.002.2573.002.2577
4.202.2514.002.2523
5.002.2465.002.2466
6.202.2388.002.2233
7.002.2329.002.2129
8.202.22110.002.2008
9.002.21211.252.1831
10.202.19812.002.1710
11.02.18613.002.1525
12.202.167
13.002.152
14.202.126
15.002.106
16.202.072
17.002.045
Zinc Sulphide 3

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