Signification et objectif
4.1 Pour de nombreuses applications, the ability of a paint or coating to resist deterioration of physical and optical properties due to exposure to light, chaleur, and water may be very important. This practice aims to cause changes in attributes related to end-use conditions, including the effects of daylight, humidité, and heat. The exposures used in this practice are not intended to model the deterioration caused by local weather phenomena such as atmospheric pollution, biological attack, and saline-water exposure.

4.2 Note – Results may change when different operating conditions are used. Donc, no reference to the use of this practice may be made unless accompanied by a report prepared in accordance with Section 9 décrivant les conditions opératoires spécifiques utilisées. See Practice G151 for details of the caveats applicable to the use of the results obtained under this practice.

Note 2: Pour plus d’informations sur les sources de variabilité et les stratégies pour gérer la variabilité dans la conception, exécution, and data analysis of laboratory accelerated exposure trials, voir guide G141.

4.2.1 The spectral power profiles of light from xenon arcs are significantly different from those produced by light and water exposure devices using carbon arcs or other light sources. The type and rate of degradation and performance rankings produced by exposure to xenon arcs may be quite different from those produced by exposure to other types of laboratory light sources.

ASTMD 6695-2016 “Test d'exposition à l'arc au xénon pour les peintures et revêtements associés”

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same light source, filter type, and exposure conditions.

4.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of the material according to the performance class compared to other materials or controls. 6,7 Donc, it is highly recommended to expose similar materials with known properties (contrôles) en même temps que le matériel de test. At least three replications of each material are recommended to allow statistical evaluation of the results.

4.4 Test results will depend on the degree of care with which the equipment is operated according to practice G155. Important factors include regulation of line voltages, absence de sel ou d'autres dépôts d'eau, contrôle de la température et de l'humidité, and condition and age of lights and filters.

4.5 All exposures referred to in accordance with this practice shall include a complete description of the test period used.

Champ d'application
1.1 This practice includes the selection of accelerated exposure test conditions for coatings and related products in xenon arc installations according to practices G151 and G155. The practice also includes preparation of specimens, suitable test conditions for coatings, and evaluation of test results.

Note 1: This specification covers the same subject matter as ISO 16474-2, but with different technical content.

1.2SI unit values should be considered standard values. Les valeurs données entre parenthèses sont à titre indicatif uniquement.

1.3 Cette norme n'est pas destinée à traiter tous les problèmes de sécurité, si seulement, associé à son utilisation. Il est de la responsabilité des utilisateurs de cette norme d'établir des pratiques de sécurité et de santé appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation..