MATERIAL: Calcium Fluoride (CaF2)
APPLICATIONS: Widespread IR application as spectroscopic accessories, prisms and lenses. Useful application in the UV as Eximer laser windows. Available doped with europium as a gamma ray scintillator.

PROPERTY	VALUE
-OPTICAL-
Transmission Range	0.13 to 10 microns
Refractive Index	1.39908 at 5 microns
Reflection Loss	5.4% at 5 microns (2 surfaces)
Restrahlen Peak	35 microns
dN/dT	-10.6 x 10-6/°C
-PHYSICAL-
Density	3.18 gm/cc
Melting Point	1360 °C
Thermal Conductivity	9.71 Wm-1 °K-1
Thermal Expansion	18.85 x 10-6/°C
Hardness	Knoop 158.3 (100)
Specific Heat Capacity	854JKgm-1 °K-1
Dielectric Constant	6.76 at 1MHz
Young's Modulus (E)	75.8 GPa
Shear Modulus (G)	33.77 GPa
Bulk Modulus (K)	82.71 GPa
Elastic Coefficients	C11=164 C12=53 C44=33.7
Apparent Elastic Limit	36.54 MPa
Poisson Ratio	0.26
-CHEMICAL-
Solubility	0.001 7gm/100gm water at 20 °C
Molecular Weight	78.08
Class/Structure	Cubic (111) cleavage

NOTES
Calcium fluoride is grown by vacuum Stockbarger technique in diameters up to 35cm. Material for IR use is grown using naturally mined fluorite, in large quantities at relatively lowcost. Optipur® CaF2 is recommended for UV applications and is manufactured from chemically pure powder.