Corning 1.7 / 42 BLANC High index glass, low dispersion

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Corning 1.7 / 42 BLANC High index glass, low dispersion
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	3.21 g/cc	0.116 lb/in³

Thermal Properties	Metric	English	Comments
CTE, linear	8.50 µm/m-°C	4.72 µin/in-°F
Softening Point	640 °C	1180 °F
Annealing Point	535 °C	995 °F
Strain Point	640 °C	1180 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.6960 @Wavelength 656.3 nm	1.6960 @Wavelength 656.3 nm	Line: C; Hydrogen
	1.69681 @Wavelength 643.8 nm	1.69681 @Wavelength 643.8 nm	Line: C'; Cadmium
	1.70010 @Wavelength 587.6 nm	1.70010 @Wavelength 587.6 nm	Line: d; Helium
	1.70502 @Wavelength 546.1 nm	1.70502 @Wavelength 546.1 nm	Line: e; Mercury
	1.71284 @Wavelength 486.1 nm	1.71284 @Wavelength 486.1 nm	Line: F; Hydrogen
	1.71384 @Wavelength 480 nm	1.71384 @Wavelength 480 nm	Line: F'; Cadmium
Abbe Number	41.4	41.4	ve
	41.6	41.6	vd
Transmission, Visible	87.5 % @Wavelength 380 - 500 nm, Thickness 2.00 mm	87.5 % @Wavelength 380 - 500 nm, Thickness 0.0787 in	Blue light transmission factor
	87.7 % @Wavelength 380 - 780 nm, Thickness 2.00 mm	87.7 % @Wavelength 380 - 780 nm, Thickness 0.0787 in	Luminous; ISO 8980-3
UV Transmittance	<= 0.10 % @Thickness 2.00 mm	<= 0.10 % @Thickness 0.0787 in	Solar UV-B transmission factor
	40 % @Thickness 2.00 mm	40 % @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
	50.5 % @Wavelength 315 - 380 nm, Thickness 2.00 mm	50.5 % @Wavelength 315 - 380 nm, Thickness 0.0787 in

Descriptive Properties
Color	White

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CCORN906 / 233317

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