The ASTM D7869-17 standard, developed by the American Society for Testing and Materials (ASTM), describes operating procedures for a controlled glow xenon arc light and water apparatus. This procedure uses one or more lamps and optical filters to produce radiation similar to sunlight in the ultraviolet and visible range. In addition, water absorption and stress cycles experienced by automotive exterior coatings under natural weather conditions are also simulated. This application can also be applied to coatings on other transportation vehicles such as airplanes, trucks and wagons.
The test method described in ASTM D7869-17 utilizes a xenon arc light source with specified optical filters. The spectral power distribution for the lamp and special daylight filters is included in the standard appendix. Water is sprayed onto the samples during sections of several steps. The water application is such that the coatings will absorb and expel a significant amount of water during testing. Additionally, cycling between wet/dry and hot/cold causes mechanical stresses in the materials. These test conditions are designed to simulate physical and chemical stresses arising from subtropical climate environments. For example, it is used to simulate the physical and environmental stresses to which a coating for the automotive industry is subjected in a subtropical climate. Such subtropical climate conditions cause particularly severe degradation of such coatings. Furthermore, prolonged wet/dry cycling and high doses of solar radiation under these conditions are particularly important for this degradation.
The ASTM D7869-17 standard is designed to address the shortcomings of previous testing methods used for vehicle paints, particularly automotive coatings. This test procedure was developed through collaborative testing between original equipment manufacturers (OEMs), material suppliers, and test equipment manufacturers in the automotive and aerospace industries.
Our organization, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, with its trained and expert staff and advanced technological equipment, advanced light and water exposure and xenon arc exposure test for transport coatings within the scope of ASTM D7869-17 standard. also provides services.
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