Corning Unicrown Chemtemperable, UV absorbing crown glass

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Corning Unicrown Chemtemperable, UV absorbing crown glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Application : Ophthalmic lenses : Single vision, progressive addition. Information provided by Corning Incorporated.
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Physical Properties	Metric	English	Comments

Density	2.61 g/cc	0.0943 lb/in³

Thermal Properties	Metric	English	Comments
CTE, linear	9.30 µm/m-°C	5.17 µin/in-°F
Softening Point	710 °C	1310 °F
Annealing Point	520 °C	968 °F
Strain Point	710 °C	1310 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.5203 @Wavelength 656.3 nm	1.5203 @Wavelength 656.3 nm	Line: C; Hydrogen
	1.52073 @Wavelength 643.8 nm	1.52073 @Wavelength 643.8 nm	Line: C'; Cadmium
	1.523 @Wavelength 587.6 nm	1.523 @Wavelength 587.6 nm	Line: d; Helium
	1.52512 @Wavelength 546.1 nm	1.52512 @Wavelength 546.1 nm	Line: e; Mercury
	1.52918 @Wavelength 486.1 nm	1.52918 @Wavelength 486.1 nm	Line: F; Hydrogen
	1.52969 @Wavelength 480 nm	1.52969 @Wavelength 480 nm	Line: F'; Cadmium
Abbe Number	58.5	58.5	ve
	58.8	58.8	vd
Transmission, Visible	95.1 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	95.1 % @Wavelength 380 - 780 nm, Thickness 0.0787 in	Luminous; ISO 8980-3
	95.1 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	95.1 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	Blue light transmission factor
UV Transmittance	<= 0.10 % @Thickness 2.00 mm	<= 0.10 % @Thickness 0.0787 in	Solar UV-B transmission factor
	35 % @Thickness 2.00 mm	35 % @Thickness 0.0787 in	Solar UV-A transmission factor
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 0.0787 in
	47 % @Wavelength 315 - 380 nm, Thickness 2.00 mm	47 % @Wavelength 315 - 380 nm, Thickness 0.0787 in

Descriptive Properties
Color	White

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