K8 Glass is Russian substitute for Schott Glass BK7

K8 Glass is Russian substitute for Schott Glass BK7

Properties: Optical :: Thermal :: Mechanical

Optical characteristics K8

Refractive Index at ne
1.51872
Refractive Index at nF
1.52283
Thermal Coefficient of Refractive Index at l=0.546 microns,оС-1 for 0¸+20оС
2.810-6
Transmission Range, microns (thickness 10мм)
0.35¸2
Transmittance ti(l) vs. wavelength l BK7

Internal Transmittance ti(l) vs.
wavelength l
l,μm
ti(l)
0.310
0.59
0.320
0.81
0.350
0.986
0.365
0.994
0.370
0.995
0.380
0.996
0.390
0.998
0.400
0.998
0.420
0.998
0.460
0.999
0.500
0.999
0.700
0.999
1.060
0.999
1.530
0.997
1.970
0.968
2.325
0.89
Refractive Index n vs.
wavelength l
l,μm
n(l)
0.365
1.53626
0.4047
1.53024
0.4358
1.52669
0.4800
1.52283
0.4861
1.52238
0.5461
1.51872
0.5876
1.51680
0.5893
1.51673
0.6328
1.51509
0.6438
1.51472
0.6563
1.51432
0.7065
1.51289
0.8521
1.50981
1.0140
1.50731
1.0600
1.50669
1.5296
1.50094
1.9700
1.49500
2.3254
1.48929

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Thermo-physical characteristics K8

Thermal Linear Expansion at, оС-1 for -30¸+70оС
7.110-6
Thermal Conductivity, W/(m оС) at 20 оС
1.114
Specific Heat Capacity, J/(kg оС)
858.0
Melting Point, оС
559

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Mechanical characteristics K8

Density, g/cm3 at 20 оС
2.51
Poisson Ratio

0.206

Young Modulus (Е), Pa
8.1 1010