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Material	SWL cm^-1	LWL cm^-1	RI	S/D	Flatness	P_e atm	Restrahlen cm^-1	Density gm/cc	Solubility g/100g	Melting Point °C	Hardness kg/mm²	Comments	BBAR Coat	Hard Coat
AgBr	22000	255 ²⁹²	2.22@10	80/50	5	0.56	88	6.5	1.2E-05	432	7	Insoluble in water, slightly soluble in sodium hydroxide and some amines. Migrates into base metals. Will blacken under UV radiation. Cold flows and should not be used above 200°C.	N	N
AgCl	24500	353 404	1.90@10	80/50	5	0.56	123	5.6	5.2E-02	457	10	Insoluble in water, slightly soluble in sodium hydroxide and some amines. Migrates into base metals. Will blacken under UV radiation. Cold flows and should not be used above 200°C.	N	N
Al2O3	40000	1608 1834	1.76@0.6 1.77@0.6	40/20	l/2	6.1	741	4.0	0	2040	1370	GRAS. Resistant to strong acids and bases. Bi-refringent. Very durable and may be used at high temperatures.	Y 1.05	N
AMTIR	11000	593 625	2.50@10	80/50	l	0.27		4.4	0	370	170	Amorphous Material which Transmits Infrared Radiation. A chalcogenide glass which although relatively hard is also brittle. Insoluble in water and resistant to acids, it is attacked by alkalis.	Y 1.3	Y 2
BaF2	66600*	691 782	1.45@5	40/20	l/20	0.56	213	4.9	0.17	1280	82	A hard material suitable for higher pressure applications, it is extremely vulnerable to thermal shock. Almost insoluble in water, it should not be used with ammonium hydroxide, ammonium salts, complex agents such as EDTA, and acids.	N	Y 3
CaF2	79500*	896 1025	1.40@5	40/20	l/20	0.77	286	3.2	0.0017	1360	158	A very hard material similar to BaF2, but less water soluble. Still vulnerable to thermal shock and attacked by nitric acid and strong hydroxides, ammonium salts, complexing reagents such as EDTA.	N	Y 3
CdTe	17000	313 340	2.67@10	80/50	l	0.12		6.2	0	1092	45	A hard but brittle material, CdTe is insoluble in water but is attacked by HNO3.	Y 1.35	Y 2
Cleartran	22000	690 722	2.2@10	40/20	l/20	2.2	328	4.1	0	1830	240	GRAS. A water-clear form of ZnS. Properties similar to ZnS.	Y 1.25	Y 2
CsI	42000	172	1.73@10	80/50	l/10	0.12	69	4.5	44	621	20	Soft and hygroscopic, CsI is generally selected for its far-IR cut-off. Should only be exposed to anhydrous solvents; must not be used with lower alcohols or aqueous solutions. Can react with many organic compounds. A hard optical coating can help protect the surface from humidity. In powdered form can be used to make pellets. Store CsI in a desiccator or a heated cabinet.	N	Y 6
Diamond	30000	< 2	2.41@0.6	20/10	l	10.9	None	3.5	0	550^fp	5700	GRAS. Hard and chemically resistant, the Type IIA diamond is often chosen for high pressure applications. Due to its high intrinsic value, diamonds sizes are typically between 1 and 9mm. Has a characteristic absorption doublet between 1800 & 2700 cm-1.	Y 1.25	N
Ge	5500	432 574	4.00@10	60/40	l/8	1.0	None	5.3	0	936	780	Hard and very brittle, germanium is temperature sensitive. Loses transmission when heated; material becomes optically opaque at about 190C. Attacked by hot H2SO4 and aqua regia. Because of it's high RI, it suffers from large reflection losses; these can be reduced by an anti-reflection coating.	Y 2.0	Y 2
KBr	48800	345 388	1.52@10	60/40	l/20	0.02	129	2.8	53	730	6	Probably the most popular material used in IR spectroscopy, KBr is hygroscopic and must be used with anhydrous solvents. It withstands thermal and mechanical shock well, but must not be used with aqueous samples, glycerol and the lower alcohols. A hard optical coating can provide additional protection from humidity. In powdered form can be used to make pellets. Store KBr in a desiccator or a heated cabinet.	N	Y 4
KCl	55600	385 439	1.45@10	60/40	l/20	0.05	158	2.0	35	776	7	Hygroscopic and must be used with anhydrous solvents. It withstands thermal and mechanical shock well, but must not be used with lower molecular weight alcohols. A hard optical coating can provide additional protection from humidity. When anti-reflection coated, is a good CO2 laser window. Store KCl in a desiccator or a heated cabinet.	N	Y 4
KRS-5	17900	204 232	2.37@10	60/40	l/1	0.56	74	7.4	0.05	414.5	40	Extremely toxic, even by skin contact, KRS-5 should be handled with gloves or finger cots. A soft material, it cold flows and deforms under pressure, and this process is enhanced above 200C. It is attacked by complexing agents, and is slightly water soluble. Because of its high toxicity, KRS-5 should be re-polished professionally.	Y 1.2	Y 2
LiF	96150*	1105 1286	1.39@0.5	40/20	l/10	0.23	400	2.6	0.27	870	105	Slightly water soluble, LiF is a hard, brittle material. Should not be employed over 400°C; this material is sensitive to thermal shock.	N	Y 2
MgF2	90900*	1271 1457	1.38@0.5 1.39@0.5	40/20	l/20	1.0	500	3.2	0.0002	1255	415	Almost insoluble in water, MgF2 is a hard material suited to relatively high pressure applications. Bi-refringent, and subject to thermal shock. MgF2 should not be used above 500°C.	N	Y 2
NaCl	52600	457 584	1.49@10	40/20	l/20	0.05	200	2.2	36	801	18	Harder, and less hygroscopic than KBr, NaCl must be used with anhydrous solvents. It withstands thermal and mechanical shock well, but must not be used with lower alcohols or glycerol. When AR coated, NaCl makes a good CO2 laser window. Store NaCl in a desiccator or a heated cabinet. A hard optical coating can provide additional protection from humidity.	N	Y 4
Si	8900	624 969	3.41@10	60/40	l/8	1.8	None	2.3	0	1420	1150	A hard but brittle material, silicon is relatively inert. It can be attacked by a combination of HF and HNO3, but withstands thermal shock. Has a strong absorption band in the 630-590 cm-1 IR region.	Y 1.7	N
SiO2	50000	2315 2677	1.53@1	40/20	l/20	4.2		2.6	0	1713	460	GRAS. Resistant to acids and alkalis, quartz is supplied in both pre-cut windows and as cuvettes for spectroscopy.	Y 1.05	N
ZnS	17000	690 722	2.2@10	40/20	l/20	1.5	328	4.1	0	1830	240	GRAS. A relatively hard material, ZnS is resistant to thermal and mechanical shock. Almost insoluble in water, it can be attacked by strong acids and bases.	Y 1.25	Y 2
ZnSe	15000	461 508	2.40@10	40/20	l/20	1.2	219	5.3	0	1526	120	Hard and brittle, ZnSe is attacked by strong acids and bases. A hard optical coating can enhance the material's resistance to acids. Has replaced KRS-5 for most ATR applications. Popular material for laser applications.	Y 1.35	Y 4
ZrO2	40000	1431	2.13@1	60/40	l/8	1.1		5.9	0	2700	1250	A hard chemically resistant material suited to high temperatures and high pressure applications. Must not be used for pressure applications above 900C as a phase change at 1000C causes micro fractures which weakens the material. Soluble in HF and H2SO4.	Y 1.2	Y 2

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