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Harrick Scientific offers a variety of polished windows for infrared and UV-Vis spectroscopy. Our windows are available in a variety of optical materials, including BaF₂, CaF₂, Ge, KBr, NaCl, Si, SiO₂, ZnSe and ZnS. Our stock discs are listed below. All windows are sold individually. For any sizes or materials not listed, we welcome the opportunity to quote.

UV-Vis-IR Optical Materials for Windows

 nKH
(psi)
MOR*
(psi)
Useful Range cm-1 (μm)Chemical Properties
Windows
1-2mm
IRE
70mm
Al2O3 1.76 1370 65,000 66,000-2000
(0.15-5.0)
33,000-2800
(0.3-3.7)
Slightly soluble in acids and bases
BaF2 1.47 82 3900 50,000-1000
(0.2-11)
33,000-1100
(0.3-9.5)
Low water solubility; soluble in acid and NH4Cl
CaF2 1.43 158 5300 66,000-1300
(0.15-8.0)
33,000-1500
(0.3-7.0)
Insoluble in water; resists most acids and bases; soluble in NH4 salts
Ge 4.0 550 7000 5000-600
(2.0-17)
5000-900
(2.0-1.4)
Insoluble in water, soluble in hot H2SO4, aqua regia
KBr 1.52 7 160 33,000-400
(0.3-25)
20,000-500
(0.5-20)
Soluble in water, alcohol, and glycerine; hygroscopic
NaCl 1.53 15 350 28,000-700
(0.35-15)
25,000-900
(0.4-12
Hygroscopic; soluble in alcohol, water and NH3
Si 3.42 1150 9000 10,000-100
(1.0-100)
9500-1500 350-FIR
(1.06-6.7 30-FIR)
Insoluble in most acids and bases; soluble in HF and HNO3
SiO2 1.45 461 7100 57,000-4600; 3500-2800
(0.175-2.2; 2.9-3.6)
50,000-5,000
(0.2-2.0 )
Insoluble in water; soluble in HF
ZnS 2.19 355 10,000 22,000-750
(0.45-14.0)
14,000-1000
(0.7-10)
Soluble in acid; insoluble in water
ZnSe 2.40 150 8000 20,000-500
(0.5-20)
20,000-700
(0.5-14.3)
Soluble in strong acids; dissolves in HNO3
n: Refractive IndexKH: Knoop HardnessMOR: Rupture Modulus

The apparent elastic limit is reported for those materials which permanently bend prior to rupturing.

*The modulus of rupture (MOR), m, determines the size of the window needed to withstand a pressure, p.

For a four times safety factor, the thickness of a mounted window, t, with an unsupported diameter, d, is:

 

tclamped = 0.866 d (p/m)1/2

Clamped

 

tunclamped = 1.05 d (p/m)1/2

Unclamped

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