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immediate downloadReleased: 2013-03-31
BS ISO 22891:2013
Paper. Determination of transmittance by diffuse reflectance measurement
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| Standard number: | BS ISO 22891:2013 |
| Pages: | 22 |
| Released: | 2013-03-31 |
| ISBN: | 978 0 580 77261 0 |
| Status: | Standard |
DESCRIPTION
BS ISO 22891:2013
This standard BS ISO 22891:2013 Paper. Determination of transmittance by diffuse reflectance measurement is classified in these ICS categories:
- 85.060 Paper and board
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 ISO 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.