Schott IRG 25 Infrared Chalcogenide Glass

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Schott IRG 25 Infrared Chalcogenide Glass
Categories:	Ceramic; Glass; Optical; Sulfide/Chalcogenide
Material Notes:	IRG 25 has excellent transmission in the SWIR, MWIR, & LWIR. Physical properties such as low dn/dT and low dispersion enable optical engineers to design color corrected optical systems without thermal defocusing. IRG 25 is optimized for pairing within the family of IR glasses and with other IR materials to support cost effective and high performance optical designs. Furthermore, IRG 25 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	4.66 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	1.13	[GPA]
Modulus of Elasticity	22.1 GPa
Fracture Toughness	0.438 MPa-m½

Thermal Properties	Original Value	Comments
CTE, linear	14.0 µm/m-°C
Specific Heat Capacity	0.330 J/g-°C
Thermal Conductivity	0.250 W/m-K
Transformation Temperature, Tg	285 °C

Optical Properties	Original Value	Comments
Refractive Index	2.595 @Wavelength 12000 nm
	2.599 @Wavelength 11000 nm
	2.603 @Wavelength 10000 nm
	2.606 @Wavelength 9000 nm
	2.609 @Wavelength 8000 nm
	2.615 @Wavelength 6000 nm
	2.618 @Wavelength 7000 nm
	2.618 @Wavelength 5000 nm
	2.622 @Wavelength 4000 nm
	2.627 @Wavelength 3000 nm
	2.642 @Wavelength 2000 nm
	2.663 @Wavelength 1500 nm
	2.728 @Wavelength 1000 nm
	2.781 @Wavelength 850 nm
IR Transmittance	0.11 % @Wavelength 800 nm
	13.78 % @Wavelength 850 nm
	21.78 % @Wavelength 12500 nm
	21.88 % @Wavelength 13000 nm
	35.65 % @Wavelength 13500 nm
	38.19 % @Wavelength 900 nm
	40.69 % @Wavelength 12000 nm
	47.02 % @Wavelength 14000 nm
	51.92 % @Wavelength 950 nm
	56.6 % @Wavelength 11500 nm
	59.16 % @Wavelength 1000 nm
	60.66 % @Wavelength 1200 nm
	61.12 % @Wavelength 1300 nm
	61.44 % @Wavelength 1400 nm
	61.57 % @Wavelength 1450 nm
	62.04 % @Wavelength 1650 nm
	62.06 % @Wavelength 1550 nm
	62.08 % @Wavelength 1850 nm
	62.15 % @Wavelength 1750 nm
	62.24 % @Wavelength 2050 nm
	62.24 % @Wavelength 11000 nm
	62.27 % @Wavelength 2150 nm
	62.28 % @Wavelength 1950 nm
	62.3 % @Wavelength 2250 nm
	62.4 % @Wavelength 4500 nm
	62.42 % @Wavelength 2500 nm
	62.51 % @Wavelength 2350 nm
	62.51 % @Wavelength 5000 nm
	62.56 % @Wavelength 2450 nm
	62.66 % @Wavelength 3000 nm
	63.39 % @Wavelength 8000 nm
	63.58 % @Wavelength 3500 nm
	64.11 % @Wavelength 4000 nm
	64.22 % @Wavelength 10500 nm
	64.46 % @Wavelength 9000 nm
	64.61 % @Wavelength 8500 nm
	64.77 % @Wavelength 9500 nm
	65.11 % @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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CSGT9932 / 183185

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