Corning Pyrex® 7740 Borosilicate Glass Sheet

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Corning Pyrex® 7740 Borosilicate Glass Sheet (discontinued **)
Categories:	Ceramic; Glass; Optical; Oxide; Silicon Oxide
Material Notes:	Corning no longer produces this glass in sheet form, or under the Pyrex® brand name. The glass is available in powder form under the grade 7740. Pyrex® sheet provides unique chemical, thermal, mechanical, and optical properties. Tempering increases temperature and pressure capability. Used as polished and machined glass wafers for use in the MST/MEMS (Micro Systems Technology/Micro-Electrical-Mechanical Systems) technologies. Corning has discontinued selling Pyrex® sheet, but still produces this glass in powder form. Information provided by Corning Incorporated.
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Physical Properties	Original Value	Comments

Density	2.23 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	418
Modulus of Elasticity	62.75 GPa
Poissons Ratio	0.20
Shear Modulus	26.1 GPa	Calculated

Electrical Properties	Original Value	Comments
Volume Resistivity	1.20e+9 ohm-cm @Temperature 350 °C
	1.60e+11 ohm-cm @Temperature 250 °C
Dielectric Constant	4.1 @Frequency 1e+6 Hz
Dissipation Factor	0.0050 @Frequency 1e+6 Hz

Thermal Properties	Original Value	Comments
CTE, linear	3.25 µm/m-°C @Temperature 0.000 - 300 °C
Softening Point	821 °C	10^7.6 Poise
Working Point	1252 °C	10⁴ Poise
Annealing Point	560 °C	10¹³ Poise
Strain Point	510 °C	10¹⁴ Poise

Optical Properties	Original Value	Comments
Refractive Index	1.474 @Wavelength 589.3 nm

**
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