Corning PHOTOBROWN 16/45 High index photochromic crown glass

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Corning PHOTOBROWN 16/45 High index photochromic 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	Original Value	Comments

Density	2.80 g/cc

Thermal Properties	Original Value	Comments
CTE, linear	6.05 µm/m-°C
Softening Point	705 °C
Annealing Point	545 °C
Strain Point	705 °C

Optical Properties	Original Value	Comments
Refractive Index	1.59692 @Wavelength 656.3 nm	Line: C; Hydrogen
	1.59957 @Wavelength 643.8 nm	Line: C'; Cadmium
	1.60090 @Wavelength 587.6 nm	Line: d; Helium
	1.604 @Wavelength 546.1 nm	Line: e; Mercury
	1.61004 @Wavelength 486.1 nm	Line: F; Hydrogen
	1.61081 @Wavelength 480 nm	Line: F'; Cadmium
Abbe Number	45.5	ve
	45.7	vd
Transmission, Visible	22 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	Blue light transmission factor, Darkened
	29 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	Luminous, Darkened
	81 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	Blue light transmission factor, Heat Faded
	88 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	Luminous, Heat Faded
UV Transmittance	<= 0.10 % @Thickness 2.00 mm	Solar UV-B transmission factor, Heat Faded
	<= 0.10 % @Thickness 2.00 mm	Solar UV-B transmission factor, Darkened
	1.5 % @Thickness 2.00 mm	Solar UV-A transmission factor, Darkened
	6.5 % @Thickness 2.00 mm	Solar UV-A transmission factor, Heat Faded
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	t(max), Heat 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), Heat Faded
	<= 0.10 % @Wavelength 280 - 315 nm, Thickness 2.00 mm	t(avg), Darkened
	1.5 % @Wavelength 315 - 350 nm, Thickness 2.00 mm	t(max), Darkened
	2.5 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	t(moy), Darkened
	5.5 % @Wavelength 315 - 350 nm, Thickness 2.00 mm	t(max), Heat Faded
	9.5 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	t(moy), Heat Faded

Descriptive Properties
Color	Clear to medium brown

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