This part of IS0 787 describes a general method of test for
comparing the resistance to light of samples of similar types of
coloured pigments (agreed reference pigment and test sample).
Two methods of exposure are described. In method A, the
material is exposed under glass to natural light. In method 9,
the material is exposed to direct artificial light.
NOTE - When either of these general methods (A or B) is applicable
to a given pigment, only a cross-reference to the appropriate method
should be included in the International Standard relating to that pigment,
indicating any detailed modification that may be needed in view
of the special properties of the product. Only when the procedures
given in this general method are not applicable to a particular product
should a different method for comparison of resistance to light be
specified.
Diese ÖNORM beschreibt eine allgemeine Prüfmethode zum Vergleich der Lichtbeständigkeit von Proben farbiger Pigmente ähnlicher Typen (vereinbartes Referenz-Pigment und Prüfmuster). Es werden zwei Arten der Belichtung angewendet. In Verfahren A wird das Material unter Glas natürlichem Licht ausgesetzt. In Verfahren B wird das Material direktem künstlichem Licht ausgesetzt.