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BG20

BG20
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Technical Details
Internal Transmittance (Chart)

Only values between 1 and 30 with one decimal place are allowed.

SCHOTT
BG20 - BG20
Thickness
1.0
Reflection factor
0.9110
Internal Transmittance (Table)
λ [nm]
200 < 10⁻³
210 < 10⁻³
220 < 10⁻³
230 < 10⁻³
240 < 10⁻³
250 < 10⁻³
260 0.040
270 0.135
280 0.230
290 0.355
300 0.480
310 0.547
320 0.660
330 0.700
340 0.807
350 0.420
360 0.509
370 0.901
380 0.990
390 0.990
400 0.980
410 0.995
420 0.990
430 0.835
440 0.701
450 0.768
460 0.795
470 0.733
480 0.692
490 0.836
λ [nm]
500 0.889
510 0.763
520 0.770
530 0.570
540 0.797
550 0.970
560 0.762
570 0.244
580 0.153
590 0.150
600 0.580
610 0.780
620 0.980
630 0.978
640 0.990
650 1.000
660 1.000
670 0.970
680 0.930
690 0.930
700 0.990
710 0.990
720 0.980
730 0.830
740 0.320
750 0.393
760 0.710
770 0.900
780 0.870
790 0.590
λ [nm]
800 0.330
810 0.357
820 0.710
830 0.845
840 0.980
850 0.960
860 0.920
870 0.770
880 0.620
890 0.770
900 0.920
910 0.937
920 0.955
930 0.972
940 0.990
950 0.988
960 0.987
970 0.985
980 0.983
990 0.982
1,000 0.980
1,010 0.982
1,020 0.983
1,030 0.985
1,040 0.987
1,050 0.988
1,060 0.990
1,070 0.993
1,080 0.995
1,090 0.997
λ [nm]
1,100 1.000
1,110 1.000
1,120 1.000
1,130 1.000
1,140 1.000
1,150 1.000
1,160 1.000
1,170 1.000
1,180 1.000
1,190 0.996
1,200 0.992
1,250 0.990
1,300 0.990
1,350 0.905
1,400 0.820
1,450 0.735
1,500 0.650
1,550 0.765
1,600 0.880
1,650 0.920
1,700 0.960
1,750 0.915
1,800 0.870
1,850 0.800
1,900 0.730
1,950 0.783
2,000 0.837
2,050 0.890
2,100 0.907
2,150 0.923
λ [nm]
2,200 0.940
2,250 0.915
2,300 0.890
2,350 0.875
2,400 0.860
2,450 0.845
2,500 0.830
2,550 0.855
2,600 0.880
2,650 0.905
2,700 0.930
2,750 0.760
2,800 0.590
2,850 0.598
2,900 0.605
2,950 0.613
3,000 0.620
3,050 0.623
3,100 0.625
3,150 0.627
3,200 0.630
3,250 0.615
3,300 0.600
3,350 0.585
3,400 0.570
3,450 0.542
3,500 0.513
3,550 0.485
3,600 0.457
3,650 0.428
λ [nm]
3,700 0.400
3,750 0.412
3,800 0.425
3,850 0.438
3,900 0.450
3,950 0.432
4,000 0.413
4,050 0.395
4,100 0.377
4,150 0.358
4,200 0.340
4,250 0.300
4,300 0.260
4,350 0.220
4,400 0.180
4,450 0.147
4,500 0.115
4,550 0.083
4,600 0.050
4,650 0.040
4,700 0.030
4,750 0.020
4,800 0.010
4,850 0.008
4,900 0.005
4,950 0.003
5,000 < 10⁻³
5,050 < 10⁻³
5,100 < 10⁻³
5,150 < 10⁻³
Optical values
Reflection factor
Pd 0.911
Reference thickness
d [mm] 1
Refractive Indices n
nd (587.6 nm) = 1.550
Colorimetric evaluation
Illuminant A(Planck T = 2347K)
d [mm] 1 2 3
x
y
Y
λd [nm]
Pe
Illuminant Planck T = 3200 K
d [mm] 1 2 3
x
y
Y
λd [nm]
Pe
Illuminant D65 (TC = 6504 K)
d [mm] 1 2 3
x
y
Y
λd [nm]
Pe
Physical values
Density
p [g/cm3] 2.86
Bubble content
Bubble class
Transformation temperature
Tg [°C] 561
Temperature coefficient
Tk [nm/°C]
Chemical Resistance
FR class
SR class 1.0
AR class 1.0
Thermal expansion
α-30°C/+70°C [10-6/K] 8.3
α20°C/300°C [10-6/K] 9.3
α20°C/200°C [10-6/K]
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