BK7 Schott Glass Optical Properties
BK7 Optical Glass
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=