Micom offers ASTM D6625 testing as part of its UV testing services. ASTM D6625—Conducting a test of protective properties of polish applied to a painted panel using fluorescent UV-condensation light—and water—exposure apparatus—describe the procedure required for the evaluation of the protective behavior of polish film through the utilization of UV exposure, heat and moisture. Unlike the ASTM G155 and the ISO 4892-4 practices whose illuminating sources are respectively Xenon and Carbon arcs, this test protocol relies on the use of fluorescent UV light. Hence, this method is founded on the principles of the ASTM G154 standard.
Evaluation of the polish behavior through accelerated weathering—use and factor to consider:
The goal of ASTM D6625 is to assess the protective ability of a polish towards degradation caused by heat, UV light exposure and humidity through the use of an accelerated weathering test. The latter consists of exposing the sample, inside an apparatus, to water condensation, ultraviolet radiations and to a variation of temperature for a predetermined amount of time as a means to simulate the decaying occasioned by water and sunlight. This property is determined through a periodical gloss reading of the polish and the unpolished area of the sample. Furthermore, this regular assessment also allows to monitor the evolution of this attribute. Unfortunately, this method does not provide a correlation which can be used to foresee the outdoor performance of the specimen. On the other hand, this standard may appraise the relative protective performance of many polishes subjected to the same test conditions.
The main factor that has to be considered when running this test is: the amount of polish used on the sample.
Typical experimental parameters for ASTM D6625:
The number and the size of the specimens have to be specified. The specifications of the test are listed in table 1.
Table I: Typical test parameters
|Polish application conditions||Temperature between 21 and 27°C|
|Relative humidity between 20 and 80%|
|Irradiance level||Has to be specified|
|Exposure cycle||Condensation period of 4h at 50 °C (no light)|
|5h of UV exposure at 70 °C (no moisture)|
Other test methods related to ASTM D6625:
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