Crystal properties
Crystal Type	cubic
Transmission Range	< 0.15 ... 15 µm
Refractive Index	1.233 @ 10.3 µm
Reflective Loss	3.6 % @ 4.0 µm
Reststrahlen	35.8 µm
Density	2.726 g/cm3
Melting Point	980 °C / 997 °C
Molecular Weight	41.988
Thermal Conductivity	3.746 W / (m K)
Specific Heat	1088 J / (kg K) @ 0 °C
Thermal Expansion	36 × 10–6 / K @ 25 °C
Hardness (Knoop)	60
Young’s Modulus	64.79 GPa
Shear Modulus	55.14 GPa
Bulk Modulus	62.03 GPa
Elastic Coefficient	C11 = 90.9 / C12 = 26.4 / C44 = 12.7 GPa
Dielectric Constant	6.0 @ f = 2 MHz
Solubility in Water	4.22 g / 100 g @ 18 °C
Cleavage Planes	(100)
Standard Diameter	200 mm larger diameters on request
Application	Cherenkov-counter AR coating material
Remarks	very low refractive index