Semnificație și scop
4.1 Pentru multe aplicații, the ability of a paint or coating to resist deterioration of physical and optical properties due to exposure to light, căldură, and water may be very important. This practice aims to cause changes in attributes related to end-use conditions, including the effects of daylight, umiditate, and heat. The exposures used in this practice are not intended to model the deterioration caused by local weather phenomena such as atmospheric pollution, atac biologic, and saline-water exposure.

4.2 Notă – Results may change when different operating conditions are used. Prin urmare, no reference to the use of this practice may be made unless accompanied by a report prepared in accordance with Section 9 descriind condițiile specifice de funcționare utilizate. See Practice G151 for details of the caveats applicable to the use of the results obtained under this practice.

Notă 2: Pentru informații suplimentare despre sursele de variabilitate și strategiile de abordare a variabilității în proiectare, execuţie, și analiza datelor din studiile de laborator cu expunere accelerată, see 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.

ASTM D 6695-2016 “Test de expunere la arc cu xenon pentru vopsele și acoperiri aferente”

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 Prin urmare, it is highly recommended to expose similar materials with known properties (controale) at the same time as the test material. 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, absența sării sau a altor depuneri de apă, controlul temperaturii și umidității, 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.

Scopul
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.

Notă 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. Valorile date în paranteze sunt doar pentru referință.

1.3 Acest standard nu este destinat să abordeze toate problemele de siguranță, dacă există, asociat cu utilizarea acestuia. Este responsabilitatea utilizatorilor acestui standard de a stabili practici adecvate de securitate și sănătate și de a determina aplicabilitatea restricțiilor de reglementare înainte de utilizare..