Corning HPFS® 7980 ArF High Purity Fused Silica

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Corning HPFS® 7980 ArF 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. Glass HPFS® 7980 ArF Grade is UV laser resistant. Information provided by Corning Incorporated.
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Physical Properties	Metric	English	Comments

Density	2.20 g/cc	0.0795 lb/in³

Mechanical Properties	Metric	English	Comments
Knoop Microhardness	522	522	kg/mm² (100 g load)
Tensile Strength	54.0 MPa	7830 psi
Modulus of Elasticity	73.00 GPa	10590 ksi
Modulus of Rupture	0.0524 GPa	7.60 ksi	abraded
Compressive Strength	1140 MPa	165000 psi
Bulk Modulus	35.9 GPa	5210 ksi
Poissons Ratio	0.16	0.16
Shear Modulus	31.0 GPa	4500 ksi

Thermal Properties	Metric	English	Comments
CTE, linear	0.480 µm/m-°C @Temperature -100 - 100 °C	0.267 µin/in-°F @Temperature -148 - 212 °F
	0.520 µm/m-°C @Temperature 5.00 - 35.0 °C	0.289 µin/in-°F @Temperature 41.0 - 95.0 °F
	0.570 µm/m-°C @Temperature 0.000 - 200 °C	0.317 µin/in-°F @Temperature 32.0 - 392 °F
Specific Heat Capacity	0.770 J/g-°C	0.184 BTU/lb-°F
Thermal Conductivity	1.38 W/m-K	9.58 BTU-in/hr-ft²-°F
Softening Point	1590 °C	2890 °F	10^7.6 Poise
Annealing Point	1040 °C	1910 °F	10¹³ Poise
Strain Point	893 °C	1640 °F	10¹⁴ Poise

Optical Properties	Metric	English	Comments
Refractive Index	1.448866 @Wavelength 1128.950 nm	1.448866 @Wavelength 1128.950 nm	22°C, 1 atm, N₂
	1.450241 @Wavelength 1014.26 nm	1.450241 @Wavelength 1014.26 nm	22°C, 1 atm, N₂
	1.452463 @Wavelength 852.344 nm	1.452463 @Wavelength 852.344 nm	22°C, 1 atm, N₂
	1.455144 @Wavelength 706.714 nm	1.455144 @Wavelength 706.714 nm	22°C, 1 atm, N₂
	1.457016 @Wavelength 632.990 nm	1.457016 @Wavelength 632.990 nm	22°C, 1 atm, N₂
	1.45846 @Wavelength 587.7250 nm	1.45846 @Wavelength 587.7250 nm	22°C, 1 atm, N₂
	1.460076 @Wavelength 546.227 nm	1.460076 @Wavelength 546.227 nm	22°C, 1 atm, N₂
	1.463123 @Wavelength 486.269 nm	1.463123 @Wavelength 486.269 nm	22°C, 1 atm, N₂
	1.466691 @Wavelength 435.957 nm	1.466691 @Wavelength 435.957 nm	22°C, 1 atm, N₂
	1.474539 @Wavelength 365.119 nm	1.474539 @Wavelength 365.119 nm	22°C, 1 atm, N₂
	1.484493 @Wavelength 312.657 nm	1.484493 @Wavelength 312.657 nm	22°C, 1 atm, N₂
	1.521154 @Wavelength 228.872 nm	1.521154 @Wavelength 228.872 nm	22°C, 1 atm, N₂
	1.542665 @Wavelength 206.266 nm	1.542665 @Wavelength 206.266 nm	22°C, 1 atm, N₂
	1.558918 @Wavelength 194.227 nm	1.558918 @Wavelength 194.227 nm	22°C, 1 atm, N₂
Abbe Number	67.6	67.6	V_e
	67.8	67.8	V_d
Optical Dispersion	0.006797	0.006797	nF'-nC'
Transmission, Visible	>= 99 % @Wavelength 375 - 800 nm	>= 99 % @Wavelength 375 - 800 nm
IR Transmittance	0.00 % @Wavelength 2750 nm	0.00 % @Wavelength 2750 nm
	0.00 % @Wavelength 4300 nm	0.00 % @Wavelength 4300 nm
	12 % @Wavelength 4000 nm	12 % @Wavelength 4000 nm
	65 % @Wavelength 2200 nm	65 % @Wavelength 2200 nm
	70 % @Wavelength 3500 nm	70 % @Wavelength 3500 nm
	88 % @Wavelength 3400 nm	88 % @Wavelength 3400 nm
	>= 99 % @Wavelength 1500 nm	>= 99 % @Wavelength 1500 nm
	>= 99 % @Wavelength 1000 nm	>= 99 % @Wavelength 1000 nm
UV Transmittance	99.8 % @Wavelength 200 nm	99.8 % @Wavelength 200 nm
	>= 99.9 % @Wavelength 250 - 380 nm	>= 99.9 % @Wavelength 250 - 380 nm
	>= 99.50 % @Thickness 10.0 mm, Wavelength 193 nm	>= 99.50 % @Thickness 0.394 in, Wavelength 193 nm	Internal Transmittance T_i > 99.50 %/cm

Descriptive Properties
Birefringence	< 1 nm/cm		(lower upon request)
Homogeneity Grade	AA, A, C, F
Inclusion Class	0, 1, 2
Metallic Impurities	< 100 ppb
OH Content	800 - 1000 ppm
Optical Stress Coefficient	35.0 nm/cm MPa
Striae Class	5		ISO 10110-4

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CCORNG09q / 281586

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