NG4

NG4

Neutral filters exhibit almost constant attenuation inside the visible spectrum. They appear grey.

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*product image is exemplary.

Spectral values guaranteed
τi (405nm) =0.27± 0,03
τi (546nm) =0.31± 0,03
τi (694nm) =0.39± 0,04
Download Data sheet
Glass type
 Article L
 W
 T
 Weight

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

SCHOTT
NG4 - NG4
Thickness
1.0
Reflection factor
0.9223
λ [nm]
200 < 10⁻³
210 < 10⁻³
220 < 10⁻³
230 < 10⁻³
240 < 10⁻³
250 < 10⁻³
260 < 10⁻³
270 < 10⁻³
280 < 10⁻³
290 < 10⁻³
300 < 10⁻³
310 < 10⁻³
320 < 10⁻³
330 < 10⁻³
340 0.006
350 0.034
360 0.089
370 0.139
380 0.144
390 0.225
400 0.269
410 0.275
420 0.281
430 0.291
440 0.289
450 0.302
460 0.316
470 0.315
480 0.309
490 0.302
λ [nm]
500 0.298
510 0.296
520 0.297
530 0.301
540 0.305
550 0.306
560 0.304
570 0.298
580 0.292
590 0.289
600 0.291
610 0.297
620 0.302
630 0.305
640 0.307
650 0.309
660 0.316
670 0.328
680 0.348
690 0.369
700 0.387
710 0.400
720 0.408
730 0.412
740 0.413
750 0.414
760 0.412
770 0.409
780 0.405
790 0.401
λ [nm]
800 0.397
810 0.392
820 0.386
830 0.381
840 0.375
850 0.368
860 0.363
870 0.358
880 0.353
890 0.347
900 0.341
910 0.337
920 0.330
930 0.325
940 0.322
950 0.316
960 0.312
970 0.308
980 0.304
990 0.301
1,000 0.298
1,010 0.296
1,020 0.293
1,030 0.291
1,040 0.289
1,050 0.288
1,060 0.288
1,070 0.286
1,080 0.287
1,090 0.286
λ [nm]
1,100 0.286
1,110 0.288
1,120 0.290
1,130 0.292
1,140 0.295
1,150 0.297
1,160 0.299
1,170 0.302
1,180 0.304
1,190 0.307
1,200 0.310
1,250 0.328
1,300 0.353
1,350 0.386
1,400 0.419
1,450 0.452
1,500 0.476
1,550 0.495
1,600 0.507
1,650 0.512
1,700 0.511
1,750 0.511
1,800 0.515
1,850 0.522
1,900 0.529
1,950 0.542
2,000 0.553
2,050 0.566
2,100 0.577
2,150 0.587
λ [nm]
2,200 0.597
2,250 0.608
2,300 0.620
2,350 0.629
2,400 0.636
2,450 0.642
2,500 0.647
2,550 0.652
2,600 0.654
2,650 0.653
2,700 0.610
2,750 0.275
2,800 0.146
2,850 0.132
2,900 0.147
2,950 0.168
3,000 0.190
3,050 0.218
3,100 0.245
3,150 0.273
3,200 0.300
3,250 0.326
3,300 0.337
3,350 0.320
3,400 0.270
3,450 0.205
3,500 0.140
3,550 0.094
3,600 0.070
3,650 0.056
λ [nm]
3,700 0.070
3,750 0.101
3,800 0.133
3,850 0.154
3,900 0.140
3,950 0.112
4,000 0.094
4,050 0.090
4,100 0.094
4,150 0.098
4,200 0.100
4,250 0.093
4,300 0.073
4,350 0.057
4,400 0.040
4,450 0.025
4,500 0.016
4,550 0.010
4,600 0.006
4,650 0.004
4,700 0.002
4,750 0.001
4,800 < 10⁻³
4,850 < 10⁻³
4,900 < 10⁻³
4,950 < 10⁻³
5,000 < 10⁻³
5,050 < 10⁻³
5,100 < 10⁻³
5,150 < 10⁻³
Reflection factor
Pd 0.922
Reference thickness
d [mm] 1
Spectral values guaranteed
τi (405nm) =0.27± 0,03
τi (546nm) =0.31± 0,03
τi (694nm) =0.39± 0,04
Refractive Indices n
nF (486.1 nm) = 1.509
nh (404.7 nm) = 1.517
ng (435.8 nm) = 1.514
ns (852.1 nm) = 1.496
ne (546.1 nm) = 1.505
nd (587.6 nm) = 1.503

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
Density
p [g/cm3] 2.4203
Bubble content
Bubble class 2
Transformation temperature
Tg [°C] 470
Temperature coefficient
Tk [nm/°C]
Chemical Resistance
FR class 1
SR class 2.2
AR class 1.0
Thermal expansion
α-30°C/+70°C [10-6/K] 6.54
α20°C/300°C [10-6/K] 7.08
α20°C/200°C [10-6/K]
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