Corning XDF DARK GRAY Tinted Photochromic Glass

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Corning XDF DARK GRAY Tinted Photochromic Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Application : Pretinted 45% photochromic glass suited for general or special purpose Tinted Glasses. Neutral gray with excellent color rendition. Pass cited standards for traffic signal recognition at 2 mm thickness. Blanks for corrective lenses available on request. Information provided by Corning Incorporated.
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Physical Properties	Original Value	Comments

Density	2.41 g/cc

Thermal Properties	Original Value	Comments
CTE, linear	6.50 µm/m-°C @Temperature 20.0 - 300 °C
Softening Point	665 °C
Annealing Point	495 °C
Strain Point	665 °C

Optical Properties	Original Value	Comments
Refractive Index	1.52017 @Wavelength 656.3 nm	Line: C; Hydrogen
	1.52064 @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
	1.52933 @Wavelength 486.1 nm	Line: F; Hydrogen
	1.52992 @Wavelength 480 nm	Line: F'; Cadmium
Abbe Number	56.6	ve
	57	vd
Transmission, Visible	15.5 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	Luminous, Darkened
	16 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	Blue light transmission factor, Darkened
	44 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	Luminous, Faded
	45 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	Blue light transmission factor, 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
	1.5 % @Thickness 2.00 mm	Solar UV-A transmission factor, Darkened
	4.5 % @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
	2.0 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	t(moy), Darkened
	3.0 % @Wavelength 315 - 350 nm, Thickness 2.00 mm	t(max), Faded
	7.0 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	t(moy), Faded

Descriptive Properties
Color	Gray

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