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Accessories & Supplies

Infrared Window Materials

Window Material
Range (cm-1)
R.Index
Solubility
(g/100g)
General Properties
Sodium Chloride (NaCl)
48,000 - 388
1.52
36
Soluble in water and glycerine and slightly soluble to alcohol. Fairly resistant to thermal and mechanical shock.
Potassium Bromide (KBr)
55,600 - 439
1.46
65
Soluble in water and alcohol. Slightly soluble in ether. Fairly good resistance to thermal and mechanical shock.
Calcium Fluoride (CaF2)
79,500 - 1,025
1.40**
35
Less soluble than NaCl with lower reflection losses. Extended transmission range. Hygroscopic.
Barium Fluoride (BaF2)
66,600 - 782
1.42
0.0017
Insoluble in water, resists most acids and alkalis. Soluble in ammonium salts. Its high mechanical strength makes it particularly useful for high pressure work.
Cesium Iodide (CsI)
42,000 - 172
1.73
44
Soluble in water and alcohol. Wide transmission range. Good resistance to shock. Soft and hygroscopic.
Thalium Bromo-iodide (KRS-5)
17,900 - 232
2.37
0.05
Slightly soluble in water; soluble in bases, not in acids. Good transmission range, ideal for ATR work. Not hygroscopic. Soft- will deform. Highly toxic.
Silver Bromide (AgBr)
22,000 - 292
2.22
1.2E-05
Insoluble in water, soluble in acids. Attacks base metals. Sensitive to mechanical shock. Crystal tends to darken when exposed to ultraviolet light. Easily scratched. Will cold flow.
Silver Chloride (AgCl)
24,500 - 400
1.90
5.2E-02
Insoluble in water, soluble in acids. Attacks base metals. Sensitive to mechanical shock. Crystal tends to darken when exposed to ultraviolet light. Easily scratched. Will cold flow.
Silicon (Si)
10,000
1,540
3.41
500 - 300
0
A hard, brittle material and is relatively inert. Can be attacked by a combination of HF and HNO3 but withstands thermal shock. Has strong absorption band in infrared.
Fused Silica (SiO2)
50,000 - 2,677
1.42***
0
Infrared grade SiO2 is insoluble in water and slightly soluble in bases. Extends into the near infrared region.
Germanium (Ge)
5,500 - 574
4.0
0
Insoluble in water. Suitable for ATR work, but where high pressure contact is not required. Very brittle. High reflection losses due to low transmission levels.
Zinc Selenide (ZnSe)
15,000 - 508
2.40
0
Insoluble in water. Slightly soluble in acids. High resistance to chemical attack. Organic solvents, dilute acids and bases have no effect. Ideal for ATR work because of its low absorption in the infrared region..
Zinc Sulfide (ZnS)
17,000 - 722
2.20
0
Insoluble in water, normal acids and bases. Reacts to strong oxidizing agents. Good resistance to thermal and mechanical shock.

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