OPTICAL
	Transmission Range	0.12 to 8.5 microns
	Refractive Index	1.3943 at 0. 5 microns
	Reflection Loss	5.4% at 0.5 µm (2 surfaces)
	Restrahlen Peak	25 microns
	dN/dT	-12.7 x 10-6/ °C at 0.6 microns
PHYSICAL
	Density	2.63905 g/cm3
	Melting Point	870 °C
	Thermal Conductivity	4. 01 W/(m K) at 41 °C
	Thermal Expansion	37 x 10-6/ °C
	Hardness	Knoop 102 to 113 kg/mm2 with 600g indenter
	Specific Heat Capacity	1562 J/(kg K) at 10 °C
	Dielectric Constant	9.1 at 25 °C
	Young's Modulus (E)	64.79 GPa
	Shear Modulus (G)	55.14 GPa
	Bulk Modulus (K)	62.03 GPa
	Elastic Coefficients	C11=97.4 C12=40.4 C44=55.4
	Apparent Elastic Limit	11.2 MPa
	Poisson Ratio	0.326
CHEMICAL
	Solubility	0.27g/l00g water at 20 °C
	Molecular Weight	25.94
	Class/Structure	FCC, NaCl structure. Cleavage (100)

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