Corning HPFS® 7980 Standard Grade High Purity Fused Silica

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Corning HPFS® 7980 Standard Grade High Purity Fused Silica
Categories:	Ceramic; Glass; Optical
Material Notes:	Glass HPFS® 7980 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, exceptional transmittance from the deep ultraviolet through the infrared region, and an ultra-low thermal expansion coefficient. HPFS® 7980 Standard Fluorescence-Free Grade available upon request. 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	1590 °C	10^7.6 Poise
Annealing Point	1040 °C	10¹³ Poise
Strain Point	893 °C	10¹⁴ Poise

Optical Properties	Original Value	Comments
Refractive Index	1.448866 @Wavelength 1128.950 nm	22°C, 1 atm, N₂
	1.450241 @Wavelength 1014.26 nm	22°C, 1 atm, N₂
	1.452463 @Wavelength 852.344 nm	22°C, 1 atm, N₂
	1.455144 @Wavelength 706.714 nm	22°C, 1 atm, N₂
	1.457016 @Wavelength 632.990 nm	22°C, 1 atm, N₂
	1.45846 @Wavelength 587.7250 nm	22°C, 1 atm, N₂
	1.460076 @Wavelength 546.227 nm	22°C, 1 atm, N₂
	1.463123 @Wavelength 486.269 nm	22°C, 1 atm, N₂
	1.466691 @Wavelength 435.957 nm	22°C, 1 atm, N₂
	1.474539 @Wavelength 365.119 nm	22°C, 1 atm, N₂
	1.484493 @Wavelength 312.657 nm	22°C, 1 atm, N₂
	1.521154 @Wavelength 228.872 nm	22°C, 1 atm, N₂
	1.542665 @Wavelength 206.266 nm	22°C, 1 atm, N₂
	1.558918 @Wavelength 194.227 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 2750 nm
	0.00 % @Wavelength 4300 nm
	12 % @Wavelength 4000 nm
	65 % @Wavelength 2200 nm
	70 % @Wavelength 3500 nm
	88 % @Wavelength 3400 nm
	>= 99 % @Wavelength 1500 nm
	>= 99 % @Wavelength 1000 nm
UV Transmittance	99.8 % @Wavelength 200 nm
	>= 99.9 % @Wavelength 250 - 380 nm
	>= 88.00 % @Thickness 10.0 mm, Wavelength 185 nm	Internal Transmittance T_i > 88.00 %/cm

Descriptive Properties
Birefringence	< 5 nm/cm	(lower upon request)
Homogeneity Grade	AA - F
Inclusion Class	0 - 5
Metallic Impurities	< 1000 ppb
OH Content	800 - 1000 ppm
Optical Stress Coefficient	35.0 nm/cm MPa
Striae Class	5	ISO 10110-4

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CCORNG09o / 281584

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