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Ensinger PEI

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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 PropertiesOriginal ValueComments
Density 2.41 g/cc
 
Thermal PropertiesOriginal ValueComments
CTE, linear 6.35 µm/m-°C
Softening Point 665 °C
Annealing Point 495 °C
Strain Point 665 °C
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.52016
@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
 1.52523
@Wavelength 546.1 nm
Line: e; Mercury
 1.52944
@Wavelength 486.1 nm
Line: F; Hydrogen
 1.52999
@Wavelength 480 nm
Line: F'; Cadmium
Abbe Number 56.2ve
 56.4vd
 
Descriptive Properties
ColorClear to medium brown.

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