Artificial weathering involves exposing test specimens to an artificial UV light source in a cabinet in which the temperature, humidity and water spray are controlled. The key parameter in all accelerated weathering apparatus is the UV light source, which should ideally simulate solar radiation.<\/p>\n
It is important to note that there is no \u201cfoolproof\u201d test that will provide an accurate prediction of service performance and life expectancy or that will accommodate the wide range of climatic conditions experienced geographically. As can be seen in the image below, just in Australia alone the UV levels vary between states and throughout the year.<\/p>\n
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Image Source: Commonwealth of Australia, BOM – 2012<\/em><\/span><\/p>\n Artificial light sources used in Australia for UV resistance assessment are the Xenon-arc lamp combined with a number of different filters to simulate various exposure conditions (e.g.: ISO 4892.2, AATCC TM169, ASTM G155) <\/strong>and Fluorescent tube – UVA & UVB (ISO 4892.3, ASTM G154).<\/strong><\/p>\n How can we help you?<\/strong><\/span><\/p>\n AWTA Product Testing can provide UV exposure testing with both the Weatherometer, using a Xenon-Arc lamp or the QUV tester, using UV-A or UV-B lamps. Detailed information on these exposures, including some typically requested cycles from the ASTM methods follow.<\/p>\n Technologists are available to discuss these options, as well as other national and international standard methods with you, and can provide a detailed quotation for your preferred options.<\/p>\n The test exposure fees quoted include access to the entire machine for the exposure period. Test specimens can be removed from the apparatus to conduct performance tests or appearance assessment as required during this time. Appearance assessment may include such processes such as colour change, gloss change and cracking\/peeling \/ texture changes. A separate fee may be charged for these types of assessments.<\/p>\n UV exposure using Weatherometer tester (Xenon Arc light source)<\/strong><\/span><\/p>\n The Weatherometer accommodates up to 48 specimens (75mm x 150mm). A reduced number of larger specimens can also be exposed. Specimens are exposed to repetitive cycles of light and moisture under controlled environmental conditions. Moisture is usually produced by condensation of water vapour onto the test specimen or by spraying the specimens with demineralized\/deionized water.<\/p>\n The exposure condition may be varied by selection of:<\/p>\n Some commonly used exposure conditions for simulating weathering are listed below. (These examples have been taken from Table X3, ASTM G155).<\/p>\n\n