ALKOR Technologies - your CRYSTAL optics supplier.   ALKOR Technologies - your CRYSTAL optics supplier.
ALKOR Technologies - your CRYSTAL optics supplier.
Materials>>Zinc Sulphide

ZnS windows, Zinc Sulphide optics FLIR grade

Alkor Technologies - manufacturer of Zinń Sulphide optical components including ZnS windows, wedges and ZnS lenses. ZnS grown by chemical vapor desposition (CVD) exhibits exceptional fracture strength and hardness leading to its frequent choice for environments. This material is often used in the 8 to 12 microns region. Its high resistance to rain erosion and high-speed dust and particulate abrasion makes it particularly suitable for exterior IR windows on aircraft frames.

Alkor Technologies produces custom Zinc Sulphide windows and wedges according to your specifications. ZnS has a lower cost relative to ZnSe and ZnS MS, and has potential wherever a tough and strong IR transmitting material is required. Please send us your specifications, we will quote it within 24hrs.

Physical properties of ZnS Optical properties of ZnS
Crystalline lattice cubic 10% transmission limits (t=6mm) 1.0 - 14µm
Density ( 298 K, ć/ńģ3 ) 4.09 Thermal - optical   coefficient dn/dT(298-358K)

(K-1 @ 1.15µm)

4.6 x 10-5

Melting temperature, °Ń (at 370 kPa) 1820 (K-1 @ 3.39µm) 4.3 x 10-5
Resistivity, (ohm · cm) ~1012 (K-1 @ 10.6µm) 4.1 x 10-5
Thermal conductivity ( 298 K , J/( K·m·sec)) 16.7 Bulk absorption coefficient
(cm-1 @ 1.3µm) 2.0 x 10-2
(cm-1 @ 2.7µm) 4.0 x 10-2
Thermal expansion  coefficient,K-1 273 K 6.6 x 10-6 (cm-1 @ 3.8µm) 2.0 x 10-2
373 K 7.3 x 10-6 (cm-1 @ 5.25µm) 4.0 x 10-2
473 K 7.7 x 10-6 (cm-1 @ 10.6µm) 2.0 x 10-1
Heat capacity ( 298 K, J/(g · K)) 0.469 Refractive index 0.42µm 2.516
Knoop hardness ( kg/mm2 ) 250 1µm 2.292
Young modulus (E), GPa 74.5 3µm 2.257
Bulk modulus (K), GPa 40 5µm 2.246
Limit of  elasticity, MPa 84 10.6µm 2.192
Poisson ratio 0.29 15µm 2.106
Chemical purity (%) 99.996(4N6) 18.20µm 1.998

ZnS Transmission