ASTM D7869 It is a xenon lamp accelerated aging testing standard for coatings used in transportation vehicles. The development of this method is aimed at addressing the lack of historical testing for coatings used in transportation, especially automotive coatings. It is currently considered one of the more well researched laboratory accelerated aging testing methods.This testing standard is based on2013Annual release, aimed at replacing and improvingSAE J2527——Performance based standards for accelerating exposure of automotive exterior materials using controlled irradiance xenon arc equipment.ASTM D7869based onASTM G155It is the result of ten years of research in the automotive, aerospace, coatings, and weather resistance testing industries. This testing program is used to simulate the physical and environmental stress exposure of coatings for external transportation applications (such as automobiles) in subtropical climates (such as southern Florida). There is evidence to suggest that this subtropical climate leads to了The coatinggenerateEspecially severe deterioration. In addition to high doses of solar radiation, prolonged exposure to rain and humidity found in southern Florida/Dry cycling is particularly important for the deterioration of material properties;

ASTM D7869The standard specifies the operating procedures for controlled irradiance xenon arc lamps and water equipment. This program uses one or more lights and filters to generate something similar toUVThe irradiance of sunlight within the visible light range. It also simulates the water absorption and stress cycling experienced by automotive exterior wall coatings under natural weathering conditions. This approach has also been found to be applicable to coatings on other transport vehicles, such as aircraft such as airplanes, trucks, and rail vehicles.

ASTM D7869The standard sets the irradiance level at340nmbe in0.40and0.80W /（m² ·nm）Changes between them. Spray water on the surface of the sample during several dark steps. The application of water causes the coating to absorb and desorb a large amount of water during testing. In addition, wet/Dry and warm/The cycle between cold will cause mechanical stress in the material. These test conditions are designed to simulate physical and chemical stresses in subtropical climate environments, such as southern Florida.

target, aim at, address, focus on, in response toASTM D7869The testing standard is applicable to xenon arc lamp equipment with flat and rotating drum structures, as well as test chambers with temperature, relative humidity, and water spray functionsThe detailed experimental procedure is as follows:

Q-Sun Xe-3-HSEXenon lamp seriesThe test chamber meets the requirementsASTM D7869Testing standards,This series of xenon lamp equipment uses three xenon arc tubes to simulate the full spectrum sunlight outdoors, with irradiance control,BPblackboard/IBPBlack label temperature monitoring, controllable air temperature inside the box, continuously adjustable relative humidity, water spray simulating the destructive effect of precipitation on materials.When running this test standard, the specific operating conditions are set as shown in the following figure:

Q-SUN Xe-3-HSExenon lamptest chamberThe sample testing chamber isSliding bracketDesign, sample effective exposure areafor450mm x 720mm, tablet stylePlacement designMore convenient for sample installationIt can fully and effectively utilize the sample placement space of the entire tray bracket.

More detailed information，Please consult the United StatesQ-LabAuthorized agent in China, Sales Department of Shanghai Yunding International Trade Co., Ltd