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	Original Value	Comments

Density	2.38 g/cc

Thermal Properties	Original Value	Comments
CTE, linear	6.22 µm/m-°C
Softening Point	634 °C
Annealing Point	493 °C
Strain Point	634 °C

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

Descriptive Properties
Color	Clear to Dark gray

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CCORN921 / 233332

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