Schott IRG 22 Infrared Chalcogenide Glass

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Schott IRG 22 Infrared Chalcogenide Glass
Categories:	Ceramic; Glass; Optical; Sulfide/Chalcogenide
Material Notes:	IRG 22 has excellent transmission in the SWIR, MWIR, & LWIR and has the best transmission of the IRG series in the NIR band with transmission beginning as low as 0.7 µm. With physical properties such as low dn/dT and low dispersion enables the optical engineers to design color corrected optical systems without thermal defocusing. IRG 22 is optimized for pairing within the family of IR glasses as well as other IR materials to support cost effective and high performing optical designs. Furthermore, IRG 22 can be processed by conventional grinding and polishing, single point diamond turning, or molding to support low to high volume component level fabrication. Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	4.41 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	1.41	[GPA]
Modulus of Elasticity	21.5 GPa
Poissons Ratio	0.209	Calculated
Fracture Toughness	0.550 MPa-m½
Shear Modulus	1290 ksi

Thermal Properties	Original Value	Comments
CTE, linear	12.1 µm/m-°C
Specific Heat Capacity	0.330 J/g-°C
Thermal Conductivity	0.240 W/m-K
Transformation Temperature, Tg	368 °C

Optical Properties	Original Value	Comments
Refractive Index	2.489 @Wavelength 12000 nm
	2.493 @Wavelength 11000 nm
	2.496 @Wavelength 10000 nm
	2.499 @Wavelength 9000 nm
	2.502 @Wavelength 8000 nm
	2.505 @Wavelength 7000 nm
	2.507 @Wavelength 6000 nm
	2.51 @Wavelength 5000 nm
	2.513 @Wavelength 4000 nm
	2.518 @Wavelength 3000 nm
	2.529 @Wavelength 2000 nm
	2.596 @Wavelength 1000 nm
Transmission, Visible	4.69 % @Wavelength 750 nm
IR Transmittance	3.98 % @Wavelength 12500 nm
	6.47 % @Wavelength 13000 nm
	17.86 % @Wavelength 12000 nm
	24.58 % @Wavelength 13500 nm
	32.98 % @Wavelength 800 nm
	43.43 % @Wavelength 14000 nm
	49.53 % @Wavelength 11500 nm
	49.76 % @Wavelength 850 nm
	56.57 % @Wavelength 900 nm
	59.16 % @Wavelength 950 nm
	60.43 % @Wavelength 1000 nm
	62.51 % @Wavelength 1100 nm
	63.64 % @Wavelength 11000 nm
	63.79 % @Wavelength 1200 nm
	64.06 % @Wavelength 8000 nm
	64.5 % @Wavelength 1300 nm
	64.9 % @Wavelength 1400 nm
	65.08 % @Wavelength 1450 nm
	65.42 % @Wavelength 1550 nm
	65.99 % @Wavelength 1650 nm
	66.09 % @Wavelength 1750 nm
	66.2 % @Wavelength 1850 nm
	66.33 % @Wavelength 1950 nm
	66.4 % @Wavelength 4500 nm
	66.52 % @Wavelength 2050 nm
	66.55 % @Wavelength 2250 nm
	66.56 % @Wavelength 2150 nm
	66.68 % @Wavelength 2500 nm
	66.74 % @Wavelength 2350 nm
	66.76 % @Wavelength 2450 nm
	66.94 % @Wavelength 5000 nm
	67.13 % @Wavelength 10500 nm
	67.29 % @Wavelength 3000 nm
	67.51 % @Wavelength 3500 nm
	67.75 % @Wavelength 8500 nm
	67.76 % @Wavelength 9500 nm
	67.78 % @Wavelength 9000 nm
	67.92 % @Wavelength 4000 nm
	67.97 % @Wavelength 10000 nm

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

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CSGT9929 / 183182

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