Corning PHOTOGRAY THIN & DARK™ Wide range photochromic glass for thin lenses

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Corning PHOTOGRAY THIN & DARK™ Wide range photochromic glass for thin lenses
Categories:	Ceramic; Glass; Optical
Material Notes:	Application : Ophthalmic lenses : Single vision, G&P progressive addition Information provided by Corning Incorporated.
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Physical Properties	Metric	English	Comments

Density	2.38 g/cc	0.0860 lb/in³

Thermal Properties	Metric	English	Comments
CTE, linear	6.22 µm/m-°C	3.46 µin/in-°F
Softening Point	634 °C	1170 °F
Annealing Point	493 °C	919 °F
Strain Point	634 °C	1170 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.52021 @Wavelength 656.3 nm	1.52021 @Wavelength 656.3 nm	Line: C; Hydrogen
	1.52063 @Wavelength 643.8 nm	1.52063 @Wavelength 643.8 nm	Line: C'; Cadmium
	1.523 @Wavelength 587.6 nm	1.523 @Wavelength 587.6 nm	Line: d; Helium
	1.52518 @Wavelength 546.1 nm	1.52518 @Wavelength 546.1 nm	Line: e; Mercury
	1.52938 @Wavelength 486.1 nm	1.52938 @Wavelength 486.1 nm	Line: F; Hydrogen
	1.52989 @Wavelength 480 nm	1.52989 @Wavelength 480 nm	Line: F'; Cadmium
Abbe Number	56.7	56.7	ve
	57	57	vd
Transmission, Visible	14 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	14 % @Wavelength 380 - 780 nm, Thickness 0.0787 in	Luminous, Darkened
	14 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	14 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	Blue light transmission factor, Darkened
	86.5 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	86.5 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	Blue light transmission factor, Faded
	91 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	91 % @Wavelength 380 - 780 nm, Thickness 0.0787 in	Luminous, Faded
UV Transmittance	<= 0.10 % @Thickness 2.00 mm	<= 0.10 % @Thickness 0.0787 in	Solar UV-B transmission factor, Faded
	<= 0.10 % @Thickness 2.00 mm	<= 0.10 % @Thickness 0.0787 in	Solar UV-B transmission factor, Darkened
	1.0 % @Thickness 2.00 mm	1.0 % @Thickness 0.0787 in	Solar UV-A transmission factor, Darkened
	9.5 % @Thickness 2.00 mm	9.5 % @Thickness 0.0787 in	Solar UV-A transmission factor, Faded
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 0.0787 in	t(max), Faded
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 0.0787 in	t(max), Darkened
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 0.0787 in	t(avg), Faded
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 0.0787 in	t(avg), Darkened
	1.0 % @Wavelength 315 - 350 nm, Thickness 2.00 mm	1.0 % @Wavelength 315 - 350 nm, Thickness 0.0787 in	t(max), Darkened
	1.5 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	1.5 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	t(moy), Darkened
	10 % @Wavelength 315 - 350 nm, Thickness 2.00 mm	10 % @Wavelength 315 - 350 nm, Thickness 0.0787 in	t(max), Faded
	13 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	13 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	t(moy), Faded

Descriptive Properties
Color	Clear to Dark gray

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

CCORN921 / 233332

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