Fused
Silica comes in IR and UV grades. The IR grades are sold under several trademarks,
including Infrasil. This material
is sometimes referred to by the misnomer crystal quartz. Synthetic crystal quartz is bi-refringent and its applications differ from those of fused silica. The IR grade of this material is useful for IR
spectroscopy as a window material for cells and cuvettes.
Optical
Properties - Fused Silica (SiO2) IR Grade
Transmission
Range: 250nm to 3.5 µm
Refractive
Index: 1.50 @ 260nm,
1.40 @ 3.7µm
Physical
Properties-- Fused Silica (SiO2) IR Grade
Hardness
(Knoop): 461 psi
Apparent
Elastic Limit: 7200 psi
Modulus
of Rupture: 7100
psi
Structure:
Amorphous
Chemical
Properties - Fused Silica (SiO2) IR Grade
Solubility:
Insoluble in water.
Soluble in HF.
