This document covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent and substantially colourless plastics, using a single-beam photometer with a specified CIE Standard light source and photodetector. This document cannot be used for plastics which contain fluorescent materials. This document is applicable to transparent moulding materials, films and sheets not exceeding 10 mm in thickness. NOTE 1 Total luminous transmittance can also be determined by a double-beam spectrophotometer as in ISO 13468-2. This document, however, provides a simple but precise, practical and quick determination. This method is suitable for use not only for analytical purposes but also for quality control. NOTE 2 Substantially colourless plastics include those which are faintly tinted. NOTE 3 Specimens more than 10 mm thick can be measured provided the instrument can accommodate them, but the results might not be comparable with those obtained using specimens less than 10 mm thick.
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus
5 Test specimens
6 Conditioning
7 Procedure
8 Expression of results
9 Precision
10 Test report
Annex A Use of a compensation port to increase the efficiency of an integrating sphere (informative)
CIE 015:2018
CIE S 017:2011
IEC 60050-845:1987
ISO 11664-1:2007 Colorimetry -- Part 1: CIE standard colorimetric observers
ISO 11664-2:2007 Colorimetry -- Part 2: CIE standard illuminants
ISO 291:2008 Plastics -- Standard atmospheres for conditioning and testing
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 1: General principles and definitions
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 3: Intermediate measures of the precision of a standard measurement method