Calcium Fluoride (CaF₂) is commonly sold in two (2) grades - IR grade and UV grade. UV grade CaF₂ is more expensive. CaF₂ is used in lens for cameras, photolithography and IR spectroscopy.

 

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Optical Properties - Calcium Fluoride (CaF₂) Optical Crystals

Transmission Range: 130nm to 9µm
Refractive Index: 1.40 @ 5µm
Reflection Loss: 5.4% @ 5µm ( 2 surfaces)

Physical Properties - Calcium Fluoride (CaF₂) Optical Crystals

Melting Point: 1360° C
Hardness (Knoop): 158 psi
Young's Modulus: 75.8 GPa
Modulus of Rupture: 5300 psi
Structure: Cubic---111 cleavage plane

Chemical Properties-- Calcium Fluoride (CaF₂) Optical Crystals

Solubility: 0.0017gm./100 gm water @ 20° C. Insoluble in most bases and acids. Soluble in NH₄ salts.