PRODUCTS

Zinc Sulphide Multispectral (Zinc Sulfide) (ZnS)

Spectroscopic and thermo-mechanical properties

Transmission Range 0.37 to 13.5 μm
Refractive Index 2.20084 at 10 μm
Reflection Loss 24.7% at 10 μm (2 surfaces)
Absorption Coefficient 0.0006 cm-1 at 3.8 μm
Reststrahlen Peak 30.5 μm
dn/dT +38.7 x 10-6 /°C at 3.39 μm
dn/dμ = 0 ---
Density 4.09 g/cm3
Melting Point 1827°C (See notes below)
Thermal Conductivity 27.2 W m-1 K-1 at 298K
Thermal Expansion 6.5 x 10-6 /°C at 273K
Hardness Knoop 160 with 50g indenter
Specific Heat Capacity 515 J Kg-1 K-1
Dielectric Constant 88
Youngs Modulus (E) 74.5 GPa
Shear Modulus (G) n/a
Bulk Modulus (K) n/a
Solubility 65 x 10-6 g/100g water
Molecular Weight 97.43
Class/Structure HIP polycrystalline cubic, ZnS, F42m

Standard specifications

Orientation ---
Clear aperture >90%
Face dimensions tolerance +0/-0,1 mm
Length tolerance ±0,1 mm
Parallelism error <10 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,1 mm at 45˚
Surface quality 40-20 S-D
Surface flatness <λ/8@632,8 nm
Wavefront distortion λ/4@632,8 nm
Coatings Custom
Laser induced damage threshold ---
Mount Unmounted