BK7 Optical Glass

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Optical glass with high transmission, can be selected nearly free of bubbles and inclusions and has very good homogeneity (down to 1x10-6)


Thermal/Mechanical Properties

Density (at 20 °C/68 °F): 2.51 g/cm 3
Thermal Coefficient of Expansion (20/300 °C): 7.0 x 10-6/°C
Strain Point:°C/ °F
Annealing Point:°C/ °F
Softening Point:°C/ °F

Optical Properties

Refractive Index(l=582.1nm): 1.509
Optical transmission

Chemical Properties

Hydrolytic resistance: class 2
Acid resistance: class 1
Alkali resistance: class 2

Electrical Properties

Dielectric Constant: E=

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Updated: 27 September 2008

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Valley Design Corp. - West
151-D Harvey West Blvd.
Santa Cruz, CA 95060 		Affiliate Sites Valley Design Corp. - East
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