BS ISO 22891:2013
$102.76
Paper. Determination of transmittance by diffuse reflectance measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 22 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 7 | Introduction |
| 9 | Section sec_1 Section sec_2 Section sec_3 1 Scope 2 Normative references 3 Terms and definitions |
| 11 | Section sec_4 Section sec_5 Section sec_5.1 Section sec_5.2 Section sec_5.3 Section sec_5.4 Section sec_5.5 Section sec_5.6 4 Principle 5 Apparatus |
| 12 | Section sec_6 Section sec_7 Section sec_8 Section sec_8.1 Section sec_8.2 Section sec_8.3 Section sec_8.4 Section sec_8.5 Section sec_9 6 Sampling 7 Preparation of test pieces 8 Procedure 9 Calculation |
| 13 | Section sec_10 10 Test report |
| 14 | Annex sec_A Annex sec_A.1 Annex sec_A.2 Table tab_A.1 Annex A (normative) Spectral characteristics of reflectometers for measuring luminous reflectance factors |
| 16 | Annex sec_B Table tab_B.1 Annex B (informative) Relationship between transmittance and opacity |
| 17 | Annex sec_C Table tab_C.1 Annex C (informative) Precision |
| 18 | Table tab_C.2 |
| 19 | Reference ref_1 Reference ref_2 Reference ref_3 Reference ref_4 Reference ref_5 Reference ref_6 Bibliography |
