Optical Properties FLIR ZnS Multispectral ZnS
Transmission range in µm @10% min. 1 - 14 0.35 - 13
Transmission range in µm @50% min. 1 - 13 0.37 - 13
Refractive index 2.192 @10.6µm 2.20084 @10µm
Reflection losses in % at 1 surface 14 @10µm 14 @10µm
Reflection losses in % at 2 surfaces 24.6 @10.6µm 24.7 @10.6µm
dn/dT in 1/K 43 · 10-6 @3.39µm 38.7 · 10-6 @3.39µm
Physical Properties FLIR ZnS Multispectral ZnS
Density in g/cm³ 4.08 4.09
Melting point in °C 1827 1827
Specific heat capacity in J/(kg · K) 469 515
Thermal Conductivity in W/(m · K) 16.7 @296K 27.2 @298K
Thermal Expansion in 1/K 6.6 · 10-6 @273K 6.5 · 10-6 @273K
Dielectric constant 8.393 88
Solubility in water in g/100g unsoluble unsoluble
Mohs hardness 3.5 - 4
Knoop hardness in kg/mm² 160 160
Material type Polycrystalline, synthetic Polycrystalline, synthetic
Crystal type cubic, Zincblende structure
Crystal structure F43m F42m
Lattice constant in Å a = 5.67
Elastic coeficients in GPa C11 = 102
C12 = 64.6
C44 = 44.6
Young's Modulus (E) in GPa 87.6 33
Shear Modulus (G) in GPa 80.41
Bulk Modulus (K) in GPa 63.1
Rupture Modulus in MPa 68.9
Apparent elastic limit in MPa 103.4 68.9
Poisson ratio 0.29 0.28
Spectral Properties