Crystal properties
Crystal Type	cubic
Transmission Range	0.21 ... 26 µm
Refractive Index	1.49980 @ 9,5 µm
Reflective Loss	7.5 % @ 10.0 µm
Reststrahlen	50.1 µm
Density	2.165 g/cm3
Melting Point	801 °C
Molecular Weight	58.443
Thermal Conductivity	6.49 W/(m K)
Specific Heat	854 J/(kg K)
Thermal Expansion	44×10–6 / K @ –50...200 °C
Hardness (Knoop)	15.2 <110> 18.2 <100> (indenter load: 200 g)
Young’s Modulus	39.98 GPa
Shear Modulus	12.61 GPa
Bulk Modulus	24.42 GPa
Rupture Modulus	2.38 Mpa
Elastic Coefficient	C11 = 48.7 / C12 = 12.6 / C44 = 12.75 GPa
Dielectric Constant	5.9 @ 25 °C, f = 100 Hz...25 GHz
Solubility in Water	35.7 g / 100 g @ 0 °C
Cleavage Planes	(100)
Standard Diameter	180 mm larger diameters on request
Application	material for IR optic, CO2 laser windows
Remarks	soluble in glycerol, slightly soluble in alcohol and aquos ammonia, insoluble in HCl