Plastics - Determination of the total luminous transmittance of transparent materials - Part 2: Doublebeam instrument
NORM herausgegeben am 1.12.2021
Bezeichnung normen: ČSN EN ISO 13468-2
Zeichen: 640283
Katalog-Nummer: 513177
Ausgabedatum normen: 1.12.2021
Zahl der Seiten: 20
Gewicht ca.: 60 g (0.13 Pfund)
Land: Tschechische technische Norm
Kategorie: Technische Normen ČSN
This document covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent plastics and substantially colourless plastics, using a double-beam scanning spectrophotometer. 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 single-beam instrument as in ISO 13468-1. 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 cannot be comparable with those obtained using specimens less than 10 mm thick