Corning Astra™ Alkaline Earth Boro-Aluminosilicate Display Glass

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Corning Astra™ Alkaline Earth Boro-Aluminosilicate Display Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Astra™ Glass features a blend of low total pitch variation, low total thickness variation, and low sag to enable high-performance tablets and notebooks, as well as the next generation of 8K LCD and OLED TVs. With an optimum blend of attributes and attractive panel economics, Astra Glass performs well in oxide thin-film transistor (TFT) backplane manufacturing processes. It is available as a fusion drawn sheet. Information provided by Corning Incorporated.
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Physical Properties	Metric	English	Comments

Density	2.52 g/cc	0.0910 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	651	651	kg(f)/mm² (200 g load; 25 s dwell)
Modulus of Elasticity	81.0 GPa	11700 ksi
Poissons Ratio	0.23	0.23
Shear Modulus	33.0 GPa	4790 ksi

Electrical Properties	Metric	English	Comments
Volume Resistivity	5.00e+9 ohm-cm @Temperature 500 °C	5.00e+9 ohm-cm @Temperature 932 °F
	1.30e+14 ohm-cm @Temperature 250 °C	1.30e+14 ohm-cm @Temperature 482 °F
	1.60e+25 ohm-cm @Temperature 25.0 °C	1.60e+25 ohm-cm @Temperature 77.0 °F
Dielectric Constant	5.8 @Frequency 1000 Hz, Temperature 20.0 °C	5.8 @Frequency 1000 Hz, Temperature 68.0 °F
Dissipation Factor	0.0020 @Frequency 1000 Hz, Temperature 20.0 °C	0.0020 @Frequency 1000 Hz, Temperature 68.0 °F

Thermal Properties	Metric	English	Comments
CTE, linear	3.30 µm/m-°C @Temperature 0.000 - 300 °C	1.83 µin/in-°F @Temperature 32.0 - 572 °F
Specific Heat Capacity	0.7703 J/g-°C @Temperature 100 °C	0.1841 BTU/lb-°F @Temperature 212 °F
	0.9069 J/g-°C @Temperature 200 °C	0.2168 BTU/lb-°F @Temperature 392 °F
	0.9492 J/g-°C @Temperature 300 °C	0.2269 BTU/lb-°F @Temperature 572 °F
	1.0169 J/g-°C @Temperature 400 °C	0.24305 BTU/lb-°F @Temperature 752 °F
	1.0666 J/g-°C @Temperature 500 °C	0.25492 BTU/lb-°F @Temperature 932 °F
Thermal Conductivity	1.128 W/m-K @Temperature 100 °C	7.828 BTU-in/hr-ft²-°F @Temperature 212 °F
	1.285 W/m-K @Temperature 200 °C	8.918 BTU-in/hr-ft²-°F @Temperature 392 °F
	1.303 W/m-K @Temperature 300 °C	9.043 BTU-in/hr-ft²-°F @Temperature 572 °F
	1.402 W/m-K @Temperature 400 °C	9.730 BTU-in/hr-ft²-°F @Temperature 752 °F
	1.446 W/m-K @Temperature 500 °C	10.04 BTU-in/hr-ft²-°F @Temperature 932 °F
Softening Point	1010 °C	1860 °F	10^7.6 Poise
Annealing Point	778 °C	1430 °F	10¹³ Poise
Strain Point	725 °C	1340 °F	10^14.5 Poise

Optical Properties	Metric	English	Comments
Refractive Index	1.522 @Wavelength 589.3 nm	1.522 @Wavelength 589.3 nm
Abbe Number	62.49	62.49
Transmission, Visible	>= 90 % @Wavelength 400 - 800 nm, Thickness 0.400 mm	>= 90 % @Wavelength 400 - 800 nm, Thickness 0.0157 in

Descriptive Properties
Birefringence Constant	292 (nm/cm)/(kg/mm²)

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CCORNG991x / 281580

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