Zinc Sulfide Multispectral (ZnS MS)

Build high-performance common aperture systems that operate across wavelengths ranging from 400 nm to 12 µm with minimal scatter and excellent mechanical properties.

Coherent ZnS multispectral is zinc sulfide material that is treated by a hot isostatic press (HIP) process. Under this intense heat and pressure, defects within the crystalline lattice are virtually eliminated resulting in a water-clear material.

Zinc Sulfide Multispectral (ZnS MS) Characteristics

Coherent routinely supplies ZnS MS substrates up to 300 mm, and can provide sheet material, core-drilled blanks, edged blanks, generated curved lens blanks, and more.

ZnS MS Material Properties (at 20°C)

Physical Properties


Cubic zincblende


4.09 g/cm³

Grain Size

20 µm to 100 μm


None > 0.2 mm

Electrical Density

> 1012 ohm-cm

Optical Properties

Bulk Absorption Coefficient @ 10.6 μm

< 0.20 cm-1

Thermo-Optic Coefficient (dn/dT) @ 10.6 μm

5.4 x 10-5/°C

Refractive Index Inhomogeneity @ 0.6328 μm

< 20 x 10-6

Thermal Properties

Thermal Conductivity @ 20° C

0.27 W/cm/°C

Specific Heat

0.527 J/g/°C

Linear Expansion Coefficient @ 20° C

6.5 x 10-6/°C

Mechanical Properties

Young’s Modulus

85.5 GPa (12.4 x 106 psi)

Rupture Modulus

68.9 MPa (10,000 psi)

Knoop Hardness

150-160 kg/mm²


4.09 g/cm³

Poisson’s Ratio