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https://www.q-lab.com/resources/faqs.aspx#:~:text=A%20coatings%20manufacturer%20was%20developing%20a%20new%20type,than%20conventional%20coatings%20used%20for%20the%20same%20purpose.
https://q-lab.com/products/quv-weathering-tester/quv
The QUV accelerated weathering tester reproduces the damage caused by sunlight, rain and dew. In a few days or weeks, the QUV UV tester can reproduce the damage that occurs over months or years outdoors. To simulate outdoor weathering, the …
https://www.intertek.com/polymers/testlopedia/accelerated-weathering-by-quv/
Up to 20 test samples are mounted in the QUV and subjected to a cycle of exposure to intense ultraviolet radiation followed by moisture exposure by condensation. Various cycles are defined depending upon the intended end use application - for example, a typical cycle for automotive exterior applications would be 8 hours UV exposure at 70° C ...
https://www.q-lab.com/resources/faqs.aspx
This is much sooner than conventional coatings used for the same purpose. However, after 3 years of continual reformulation and retesting in the QUV tester, the coating was improved so that various formulations could withstand 2,000 to 4,000 hours in the QUV tester - much better than the conventional coatings.
https://cdme.osu.edu/sites/default/files/uploads/quv_accelerated_weathering_tester.pdf
Test Capacity 48 test samples 3" x 6" (75 x 150 mrn). Thickness up to 314" (20 mm). Panels are spring mounted on removable holders. Lamp Usage Lamps are rotated every 400 hours. Lamp life is 1,600 hours. Recognition The QUV conforms to ASTM G-53, D-4329, D- 4587, D-4799, SAE J2020, IS0 4892 and numer-
http://gse-co.com/pdf/13.pdf
The QUV tester’s simple, proven design makes it easy to install, easy to use, and almost maintenance-free. It operates completely automatically, 24 hours a day, 7 days a week.
https://kta.com/kta-university/accelerated-weathering-corrosion-test/
Despite the “whys” and precautionary mumbo-jumbo, some of you may be skimming this article looking for the numerical correlation between accelerated testing and real-time exposure (particularly for the most common of the UV/heat/condensation devices, which is the QUV chamber).
https://www.crtlabs.com/pdf/q-panel.pdf-explanation-manual.pdf
12 hours each day. Research indicates that the main cause of this outdoor wetness is dew, not rain. The QUV simulates this using a unique condensation mechanism. During the condensation cycle, a water reservoir in the bottom of the test chamber is heated to produce vapor. The hot vapor maintains the chamber at 100% relative humidity, at an elevated
https://myaccount.valsparcoilextrusion.com/opencms/export/sites/coilextrusion/galleries/pdfs/resources/QUV-Whitepaper_050415.pdf
between natural outdoor weathering and QUV testing and has found QUV-A 340 testing superior over QUV-B 313 testing. 3 UVA-340 Lamps vs. Sunlight UVB-313 Lamps vs. Sunlight QUV-A 340 and QUV-B 313 charts provided by Q-Lab QUV-A 340 Testing: UVA-340 lamps are the best available simulation of sunlight in the critical short-wave UV region.
https://www.micomlab.com/blog/uv-testing/uv-testing-faqs/
UV Testing FAQs – 15 most frequent questions and answers. April 28, 2017. UV Testing. This UV Testing FAQs section assembles the most frequently asked questions we receive from clients and companies regarding different UV testing procedures and tests.
https://www.finishing.com/24/01.shtml
This is 30 times the 3000 hours of test time. This is too much acceleration by any of the standards. A possible ratio is in the range of 8 to 12. This depends on the test conditions (temperature, humidity, irradiance level, condensation process, humidity, etc). ... while in the case of the QUV fluorescent tester, the median/peak irradiance ...
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