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	Metric	English	Comments

Density	2.23 g/cc	0.0806 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	418	418
Modulus of Elasticity	62.75 GPa	9101 ksi
Poissons Ratio	0.20	0.20
Shear Modulus	26.1 GPa	3790 ksi	Calculated

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.20e+9 ohm-cm @Temperature 350 °C	1.20e+9 ohm-cm @Temperature 662 °F
	1.60e+11 ohm-cm @Temperature 250 °C	1.60e+11 ohm-cm @Temperature 482 °F
Dielectric Constant	4.1 @Frequency 1e+6 Hz	4.1 @Frequency 1e+6 Hz
Dissipation Factor	0.0050 @Frequency 1e+6 Hz	0.0050 @Frequency 1e+6 Hz

Thermal Properties	Metric	English	Comments
CTE, linear	3.25 µm/m-°C @Temperature 0.000 - 300 °C	1.81 µin/in-°F @Temperature 32.0 - 572 °F
Softening Point	821 °C	1510 °F	10^7.6 Poise
Working Point	1252 °C	2286 °F	10⁴ Poise
Annealing Point	560 °C	1040 °F	10¹³ Poise
Strain Point	510 °C	950 °F	10¹⁴ Poise

Optical Properties	Metric	English	Comments
Refractive Index	1.474 @Wavelength 589.3 nm	1.474 @Wavelength 589.3 nm

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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