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, y compris les effets du soleil, 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 Caveats – 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 under Section 10 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 1: 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 an open flame carbon arc are significantly different from those generated by light and water exposure equipment using other carbon arc configurations or other light sources. The type and rate of degradation and performance ranking produced by exposure to filtered open flame carbon arcs may be quite different from those produced by exposure to other types of laboratory light sources.

ASTMD 822-2018 “Test d'exposition à l'arc de carbone à la flamme pour la filtration par filtre des peintures et revêtements associés”

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same type of carbon arcs, filtres, 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. IV,5 Donc, it is highly recommended to expose similar materials with known properties (contrôle) 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 G152. Les facteurs importants incluent la régulation de la tension de ligne, absence de sel ou d'autres dépôts d'eau, contrôle de la température et de l'humidité, et conditions des électrodes.

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

ASTMD 822-2018 “Test d'exposition à l'arc de carbone à la flamme pour la filtration par filtre des peintures et revêtements associés”

Champ d'application
1.1 This practice covers the selection of conditions for accelerated exposure testing of coatings and related products in filtered open-flame carbon arc devices in accordance with Practices G151 and G152. The practice also includes preparation of specimens, suitable test conditions for coatings, and evaluation of test results. Tableau 1 describes the commonly used test conditions.

1.2 This practice does not include closed carbon arc exposure of paint and associated coatings, which is described in Practice D5031 / D5031M. Practice D3361/D3361M covers an additional procedure for exposing these products, where specimens are exposed to radiation from an unfiltered open flame carbon arc, which produces shorter wavelengths and higher levels of shorter-wavelength radiation compared to filtered open or closed carbon arcs.

1.3 Les valeurs exprimées en unités SI ou en unités pouces-livres doivent être traitées séparément comme valeurs standard.. The values specified in each system may not be exactly equivalent; Donc, chaque système doit être utilisé indépendamment les uns des autres. Merging the values of the two systems may result in non-compliance with the criteria.

1.4 Cette norme n'est pas destinée à traiter tous les problèmes de sécurité, si seulement, associé à son utilisation. Il est de la responsabilité de l'utilisateur de cette norme d'établir des mesures de sécurité appropriées., pratiques sanitaires et environnementales et pour déterminer l’applicabilité des restrictions réglementaires avant utilisation.

1.5 La présente Norme internationale a été élaborée conformément aux principes de normalisation internationalement reconnus établis dans la Décision sur les principes pour l'élaboration de normes internationales., Lignes directrices et recommandations émises par le Comité des obstacles techniques au commerce de l'Organisation mondiale du commerce.