Corning HPFS® 7979 IR Grade High Purity Fused Silica

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Corning HPFS® 7979 IR Grade High Purity Fused Silica
Categories:	Ceramic; Glass; Optical
Material Notes:	Glass code 7979 is a high purity non-crystalline silica glass with excellent optical qualities. Product characteristics include extraordinary low refractive index variations leading to state-of-the-art homogeneity values, low birefringence, and an ultra-low thermal expansion coefficient. Information provided by Corning Incorporated.
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Physical Properties	Original Value	Comments

Density	2.20 g/cc

Mechanical Properties	Original Value	Comments
Knoop Microhardness	522	kg/mm² (100 g load)
Tensile Strength	54.0 MPa
Modulus of Elasticity	73.00 GPa
Modulus of Rupture	0.0524 GPa	abraded
Compressive Strength	1140 MPa
Bulk Modulus	35.9 GPa
Poissons Ratio	0.16
Shear Modulus	31.0 GPa

Thermal Properties	Original Value	Comments
CTE, linear	0.480 µm/m-°C @Temperature -100 - 100 °C
	0.520 µm/m-°C @Temperature 5.00 - 35.0 °C
	0.570 µm/m-°C @Temperature 0.000 - 200 °C
Specific Heat Capacity	0.770 J/g-°C
Thermal Conductivity	1.38 W/m-K
Softening Point	1630 °C	10^7.6 Poise
Annealing Point	1180 °C	10¹³ Poise
Strain Point	1070 °C	10¹⁴ Poise

Optical Properties	Original Value	Comments
Refractive Index	1.433027 @Wavelength 2326.050 nm	22°C, 1 atm, N₂
	1.44078 @Wavelength 1813.570 nm	22°C, 1 atm, N₂
	1.450304 @Wavelength 1014.26 nm	22°C, 1 atm, N₂
	1.453731 @Wavelength 780.237 nm	22°C, 1 atm, N₂
	1.456425 @Wavelength 656.454 nm	22°C, 1 atm, N₂
	1.457077 @Wavelength 632.990 nm	22°C, 1 atm, N₂
	1.458522 @Wavelength 587.725 nm	22°C, 1 atm, N₂
	1.463561 @Wavelength 480.126 nm	22°C, 1 atm, N₂
	1.471446 @Wavelength 388.975 nm	22°C, 1 atm, N₂
	1.479824 @Wavelength 334.244 nm	22°C, 1 atm, N₂
	1.491056 @Wavelength 289.444 nm	22°C, 1 atm, N₂
	1.523018 @Wavelength 226.572 nm	22°C, 1 atm, N₂
	1.542731 @Wavelength 206.266 nm	22°C, 1 atm, N₂
	1.575091 @Wavelength 184.950 nm	22°C, 1 atm, N₂
Abbe Number	67.6	V_e
	67.8	V_d
Optical Dispersion	0.006797	nF'-nC'
Transmission, Visible	>= 99 % @Wavelength 375 - 800 nm
IR Transmittance	0.00 % @Wavelength 4300 nm
	12 % @Wavelength 4000 nm
	70 % @Wavelength 3500 nm
	87 % @Wavelength 3000 nm
	98 % @Wavelength 2500 nm
	>= 99 % @Wavelength 1500 nm
	>= 99 % @Wavelength 1000 nm
	>= 99 % @Wavelength 2000 nm

Descriptive Properties
Birefringence	< 5 (nm/cm)	(lower upon request)
Homogeneity Grade	AA, A, C, F
Inclusion Class	0, 1, 2
Metallic Impurities	< 100 ppb
OH Content	< 1 ppm
Optical Stress Coefficient	35.0 nm/cm MPa
Striae Class	5	ISO 10110-4

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CCORNG09m / 281582

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