Hemispheres

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Harrick Scientific offers several hemispheres and hemicylinders for spectroscopic applications in Al₂O₃, Ge, Si and ZnSe. Our standard sizes are listed below. We welcome the opportunity to quote on other sizes and materials to meet your needs.

UV-Vis-IR Optical Materials for Hemispheres & Hemicylinders

 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
Ge 4.0 550 7000 5000-600

(2.0-17)
5000-900

(2.0-1.4)
Insoluble in water, soluble in hot H2So4 agua regia
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
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
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