Paper. Determination of transmittance by diffuse reflectance measurement
This International Standard specifies a method for the calculation of transmittance based upon diffuse reflectance measurements.
The use of the method is restricted to white and near-white translucent papers (see 3.9). If it is necessary to determine the transmittance of papers which contain fluorescent whitening agents, the fluorescence emission is eliminated using the prescribed UV cut-off filter.
NOTE This means that, although this International Standard refers to ISOÂ 2469, which permits the use of both filter colourimeters and abridged spectrophotometers, a filter colourimeter with no means of eliminating the emission of fluorescence is not suitable for this type of measurement if fluorescent whitening agents are present.
| SDO | BSI: British Standards Institution |
| Document Number | ISO 22891 |
| Publication Date | March 31, 2013 |
| Language | en - English |
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| Committee | PAI/11 |
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