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, inclusiv efectele luminii solare, 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 Caveats – 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 under Section 10 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 1: 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 unfiltered open flame carbon arcs are significantly different from those generated by light and water exposure devices using other carbon arc configurations or other light sources. The type and rate of degradation and performance ranking resulting from exposure to unfiltered open flame carbon arcs may be quite different from those resulting from exposure to other types of laboratory light sources. În general, exposure in accordance with this protocol will produce degradation more rapidly than similar exposure in accordance with practice D822/D822M or D5031/D5031M and may result in different types of degradation.

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same type of carbon arc and exposure conditions.

ASTM D 3361-2020 “Test pentru expunerea la arcul de carbon cu flacără nefiltrată a vopselelor și a acoperirilor aferente”

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 Prin urmare, it is highly recommended to expose similar materials with known properties (Control) 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 in accordance with Practice G152. Factorii importanți includ reglarea tensiunii de linie, absența sării sau a altor depuneri de apă, controlul temperaturii și umidității, și condițiile electrozilor.

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 specification covers the selection of test conditions for accelerated exposure testing of coatings and related products in unfiltered open-flame carbon arc installations in accordance with regulations G151 and G152. The practice also includes preparation of specimens, suitable test conditions for coatings, and evaluation of test results.

1.2 This practice covers the unfiltered open-flame carbon arc exposure of paints and associated coatings and covers the exposure period commonly referred to as the “dew cycle”. Practice D822/D822M describes the filtered open flame carbon arc device and Practice D5031/D5031M describes the closed carbon arc exposure. Radiation from unfiltered open flame carbon arcs produces shorter wavelengths and higher levels of shortwaver radiation compared to filtered open flame or closed carbon arcs.

ASTM D 3361-2020 “Test pentru expunerea la arcul de carbon cu flacără nefiltrată a vopselelor și a acoperirilor aferente”

1.3 Valorile exprimate în unități SI sau unități inch-lire trebuie tratate separat ca valori standard. The values specified in each system are not necessarily the same; Prin urmare, to ensure compliance with the standards, each system should be used independently of each other and the values of the two systems should not be combined.

1.4 Acest standard nu este destinat să abordeze toate problemele de siguranță, dacă există, asociat cu utilizarea acestuia. Este responsabilitatea utilizatorului acestui standard să stabilească siguranța corespunzătoare, practicile de sănătate și de mediu și pentru a determina aplicabilitatea restricțiilor de reglementare înainte de utilizare.

1.5 Acest standard internațional a fost elaborat în conformitate cu principiile de standardizare recunoscute la nivel internațional stabilite în Decizia privind principiile pentru elaborarea standardelor internaționale., Orientări și recomandări emise de Comitetul pentru bariere tehnice în calea comerțului al Organizației Mondiale a Comerțului.