Corning ULE® 7972 Ultra Low Expansion Glass

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Corning ULE® 7972 Ultra Low Expansion Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	ULE® Corning Code 7972 Ultra Low Expansion Glass is a titania silicate glass. It is used in applications ranging from machine tool reference blocks to solid and lightweight mirror blanks for large astronomical telescopes and space satellite applications. The mean linear CTE is 0 ± 30 ppb/°C from 5°C to 35°C with a 95% confidence level, and is tested on each boule. Excellent resistance to weathering. Exhibits virtually no surface clouding or electrical surface leakage when subjected to attack by water, sulfur dioxide, and other atmospheric gases. High resistance to attack by nearly all chemical agents. Information provided by Corning Incorporated.
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Physical Properties	Metric	English	Comments

Density	2.21 g/cc	0.0798 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	460	460	kg/mm² at 200g load
Tensile Strength, Ultimate	49.8 MPa	7220 psi
Modulus of Elasticity	67.6 GPa	9800 ksi
Bulk Modulus	34.1 GPa	4950 ksi
Poissons Ratio	0.17	0.17
Shear Modulus	29.0 GPa	4210 ksi

Electrical Properties	Metric	English	Comments
Volume Resistivity	4.00e+11 ohm-cm @Temperature 200 °C	4.00e+11 ohm-cm @Temperature 392 °F	100Hz

Thermal Properties	Metric	English	Comments
CTE, linear	-0.390 µm/m-°C @Temperature -100 °C	-0.217 µin/in-°F @Temperature -148 °F	Approximate Instantaneous Value
	-0.180 µm/m-°C @Temperature -50.0 °C	-0.100 µin/in-°F @Temperature -58.0 °F	Approximate Instantaneous Value
	-0.0500 µm/m-°C @Temperature 0.000 °C	-0.0278 µin/in-°F @Temperature 32.0 °F	Approximate Instantaneous Value
	-0.0300 - 0.0300 µm/m-°C @Temperature 5.00 - 35.0 °C	-0.0167 - 0.0167 µin/in-°F @Temperature 41.0 - 95.0 °F	Specified mean from 5 to 35°C
	0.0400 µm/m-°C @Temperature 150 °C	0.0222 µin/in-°F @Temperature 302 °F	Approximate Instantaneous Value
	0.0500 µm/m-°C @Temperature 50.0 °C	0.0278 µin/in-°F @Temperature 122 °F	Approximate Instantaneous Value
	0.0700 µm/m-°C @Temperature 100 °C	0.0389 µin/in-°F @Temperature 212 °F	Approximate Instantaneous Value
Specific Heat Capacity	0.767 J/g-°C @Temperature 25.0 °C	0.183 BTU/lb-°F @Temperature 77.0 °F
Thermal Conductivity	1.31 W/m-K @Temperature 25.0 °C	9.09 BTU-in/hr-ft²-°F @Temperature 77.0 °F
Softening Point	1490 °C	2710 °F
Annealing Point	1000 °C	1830 °F
Strain Point	890 °C	1630 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.4801 @Wavelength 656 nm	1.4801 @Wavelength 656 nm	nC
	1.4828 @Wavelength 589 nm	1.4828 @Wavelength 589 nm	nD
	1.4892 @Wavelength 486 nm	1.4892 @Wavelength 486 nm	nF
Abbe Number	53.1	53.1	v_d

Descriptive Properties
Stress Optical Coefficient	4.15 (nm/cm)/(kg/cm²)
Thermal Diffusivity	.0079 cm²/s

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 view all the property values for this datasheet as they were originally entered into MatWeb.

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CCORNG970 / 233285

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