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
| n | KH (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
tunclamped = 1.05 d (p/m)1/2
