Значение и цель
4.1 Для многих приложений, the ability of a paint or coating to resist deterioration of physical and optical properties due to exposure to light, нагревать, and water may be very important. This practice aims to cause changes in attributes related to end-use conditions, including the effects of daylight, влага, и тепло. The exposures used in this practice are not intended to model the deterioration caused by local weather phenomena such as atmospheric pollution, биологическая атака, and saline-water exposure.

4.2 Примечание – Results may change when different operating conditions are used. Поэтому, no reference to the use of this practice may be made unless accompanied by a report prepared in accordance with Section 9 описание конкретных условий эксплуатации, используемых. See Practice G151 for details of the caveats applicable to the use of the results obtained under this practice.

Примечание 2: Дополнительную информацию об источниках изменчивости и стратегиях устранения изменчивости в проекте см., исполнение, и анализ данных лабораторных испытаний ускоренного воздействия, см. Руководство 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.

АСТМ Д 6695-2016 “Испытание красок и сопутствующих покрытий на воздействие ксеноновой дуги”

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same light source, тип фильтра, 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 Поэтому, it is highly recommended to expose similar materials with known properties (элементы управления) одновременно с испытуемым материалом. 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, отсутствие солей и других водных отложений, контроль температуры и влажности, 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.

Объем
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, и оценка результатов испытаний.

Примечание 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. Значения, указанные в скобках, предназначены только для справки..

1.3 Настоящий стандарт не предназначен для решения всех вопросов безопасности., если таковые имеются, связанный с его использованием. Пользователи настоящего стандарта обязаны установить соответствующие правила техники безопасности и охраны труда, а также определить применимость нормативных ограничений перед использованием..