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Elmet Technologies

Corning FUSIBLE PHOTOBROWN EXTRA ™ Photochromic crown glass
Categories: Ceramic; Glass; Optical

Material Notes: Application : Ophthalmic lenses : Fused multifocal, or Progressive addition. (heat forming)

Information provided by Corning Incorporated.

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Physical PropertiesMetricEnglishComments
Density 2.41 g/cc0.0871 lb/in³
 
Thermal PropertiesMetricEnglishComments
CTE, linear 6.35 µm/m-°C3.53 µin/in-°F
Softening Point 665 °C1230 °F
Annealing Point 495 °C923 °F
Strain Point 665 °C1230 °F
 
Optical PropertiesMetricEnglishComments
Refractive Index  1.52016
@Wavelength 656.3 nm
1.52016
@Wavelength 656.3 nm
Line: C; Hydrogen
 1.52064
@Wavelength 643.8 nm
1.52064
@Wavelength 643.8 nm
Line: C'; Cadmium
 1.523
@Wavelength 587.6 nm
1.523
@Wavelength 587.6 nm
Line: d; Helium
 1.52523
@Wavelength 546.1 nm
1.52523
@Wavelength 546.1 nm
Line: e; Mercury
 1.52944
@Wavelength 486.1 nm
1.52944
@Wavelength 486.1 nm
Line: F; Hydrogen
 1.52999
@Wavelength 480 nm
1.52999
@Wavelength 480 nm
Line: F'; Cadmium
Abbe Number 56.256.2ve
 56.456.4vd
 
Descriptive Properties
ColorClear to medium brown.

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.

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