Standard window and wall thickness (1.25mm) see other dimensions
Can be used with spectrophotometers and colorimeters
Pathlengths available:1, 2, 5, 10, 20, 40, 50, 100mm
Holmium Glass Filter
Like its liquid counterpart, the holmium glass filter produces characteristic peaks that make it suitable for use as a
wavelength reference material in the UV and visible regions of the spectrum (240 nm – 640 nm). Unlike the liquid cell,
however, It is not adopted by all the Pharmacopoeias for wavelength qualification.
Didymium Glass Filter
Like its liquid counterpart, the didymium glass filter produces characteristic peaks that make it suitable for use as a
wavelength reference material in the visible region of the spectrum.
Holmium Reference for Wavelength in the Visible and UV
Holmium oxide (4%) in perchloric acid (10%) sealed in a quartz cell
Neutral Density Filter Reference Set For Validating the Visible Absorbance of your Spectrophotometer
Our neutral density filter sets are based on and traceable to the NIST sets SRM 930e and SRM 1930.
These sets are used to test the photometric scale in both Transmission and Absorbance in the visible range.
The filters are made from Schott NG-type glass which blocks known transmission and absorbance values.
We calibrate the glass type and thickness of the filters to produce the transmission and absorbance values.
The approximate values are shown in the chart below. Each NIST traceable filter set is individually tested and certified to
its transmission and absorbance values and the confidence limits of each reading.