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	Original Value	Comments

Density	2.21 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	460	kg/mm² at 200g load
Tensile Strength, Ultimate	49.8 MPa
Modulus of Elasticity	67.6 GPa
Bulk Modulus	34.1 GPa
Poissons Ratio	0.17
Shear Modulus	29.0 GPa

Electrical Properties	Original Value	Comments
Volume Resistivity	4.00e+11 ohm-cm @Temperature 200 °C	100Hz

Thermal Properties	Original Value	Comments
CTE, linear	-0.390 µm/m-°C @Temperature -100 °C	Approximate Instantaneous Value
	-0.180 µm/m-°C @Temperature -50.0 °C	Approximate Instantaneous Value
	-0.0500 µm/m-°C @Temperature 0.000 °C	Approximate Instantaneous Value
	-0.0300 - 0.0300 µm/m-°C @Temperature 5.00 - 35.0 °C	Specified mean from 5 to 35°C
	0.0400 µm/m-°C @Temperature 150 °C	Approximate Instantaneous Value
	0.0500 µm/m-°C @Temperature 50.0 °C	Approximate Instantaneous Value
	0.0700 µm/m-°C @Temperature 100 °C	Approximate Instantaneous Value
Specific Heat Capacity	0.767 J/g-°C @Temperature 25.0 °C
Thermal Conductivity	1.31 W/m-K @Temperature 25.0 °C
Softening Point	1490 °C
Annealing Point	1000 °C
Strain Point	890 °C

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

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

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CCORNG970 / 233285

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