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SCHOTT NG4, 25mm Dia., 3mm Thick, Absorptive ND Filter

SCHOTT NG Gray Glass Neutral Density (ND) Filters feature nearly constant transmittance in the visible spectrum. ✓ Shop now!

SCHOTT NG Gray Glass Neutral Density (ND) Filters

Stock #14-091
$32.50
×
Qty 1-10
$32.50
Qty 11+
$29.25
Volume Pricing
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Coating:
Uncoated
Diameter (mm):
25.00
Optical Density OD (Average):
1.58
Optical Density Tolerance (%):
(nominal)
Glass/Filter Number:
Index of Refraction nd:
1.51
Surface Quality:
60-40
Transformation Temperature (°C):
483
Thickness (mm):
3.00 ±0.2
Transmission (%):
2.6
Transmission Tolerance (%):
(nominal)
Type:
Neutral Density Filter
Parallelism (arcmin):
≤3
Dimensional Tolerance (mm):
±0.2

Regulatory Compliance

RoHS:

Product Family Description

  • Tightly Controlled Thickness Specifications
  • Standard Thicknesses of 1, 2, and 3mm
  • Even Light Attenuation in the Visible Spectrum
  • NG1, NG3, NG4, NG5, NG9 and NG11 Glass Types Available
  • Precision SCHOTT NG Glass Filters Also Available

SCHOTT NG Gray Glass Neutral Density (ND) Filters feature nearly constant transmittance in the visible spectrum, attenuating light through absorption. The filters are available in 6 materials, each with a thickness of 1, 2, or 3mm. Filters can be stacked to achieve custom optical densities. SCHOTT NG Absorptive Neutral Density Filters are used in a variety of machine vision, factory automation, and analytical instrumentation applications. Custom sizes from 5 to 160mm are available upon request; for more information, visit our Colored Glass Filter Manufacturing capabilities webpage. SCHOTT NG Absorptive Neutral Density (ND) Filters with precision optical density and transmission values are also available.

While SCHOTT NG Gray Glass Neutral Density (ND) Filters will provide consistent transmission values from 400 - 700nm, variations in filter lot manufacturing may lead to variations in transmission from filter to filter. Please see the table in the Technical Images tab for acceptable transmission variations for each glass type and thickness.

Filter Simulation Software

Click here to download SCHOTT’s colored glass filter calculation program which can be used to calculate the internal transmittance and external transmission of each SCHOTT glass type. The program can simulate the performance of individual filters with user specified thickness or of stacked filters with varying glass types and thicknesses.

Technical Information

 
 Glass Type Thickness Min. Transmission (%) Max. Transmission (%)
NG3 1 7.4 11.1
2 0.01 2.8
3 0.01 1.9
NG4 1 24.9 31.3
2 6.1 11.6
3 0.01 5.5
NG5 1 49.8 55.4
2 27.2 32.8
3 14.3 19.9
NG9 1 1.8 5.5
2 0.01 2.0
3 0.01 1.8
NG11 1 70.1 73.8
2 54.2 57.9
3 42.2 45.9
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