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	Original Value	Comments

Density	2.52 g/cc

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

Electrical Properties	Original Value	Comments
Volume Resistivity	5.00e+9 ohm-cm @Temperature 500 °C
	1.30e+14 ohm-cm @Temperature 250 °C
	1.60e+25 ohm-cm @Temperature 25.0 °C
Dielectric Constant	5.8 @Frequency 1000 Hz, Temperature 20.0 °C
Dissipation Factor	0.0020 @Frequency 1000 Hz, Temperature 20.0 °C

Thermal Properties	Original Value	Comments
CTE, linear	3.30 µm/m-°C @Temperature 0.000 - 300 °C
Specific Heat Capacity	0.7703 J/g-°C @Temperature 100 °C
	0.9069 J/g-°C @Temperature 200 °C
	0.9492 J/g-°C @Temperature 300 °C
	1.0169 J/g-°C @Temperature 400 °C
	1.0666 J/g-°C @Temperature 500 °C
Thermal Conductivity	1.128 W/m-K @Temperature 100 °C
	1.285 W/m-K @Temperature 200 °C
	1.303 W/m-K @Temperature 300 °C
	1.402 W/m-K @Temperature 400 °C
	1.446 W/m-K @Temperature 500 °C
Softening Point	1010 °C	10^7.6 Poise
Annealing Point	778 °C	10¹³ Poise
Strain Point	725 °C	10^14.5 Poise

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

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

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CCORNG991x / 281580

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