ASTM D4587 (QUV Exposure) refers to a specific type of accelerated weathering test that is commonly used to evaluate the performance of exterior coatings, including paints, varnishes, and sealants. The QUV test is conducted in accordance with ASTM D4587 and involves exposing coated samples to a combination of ultraviolet (UV) light and moisture to simulate the effects of outdoor weathering.
During the QUV test, samples are placed in a chamber where they are exposed to a cycle of intense UV light followed by exposure to moisture, which is designed to replicate the effects of sunlight, rain, and humidity. This process is repeated for a set number of hours, which varies depending on the specific testing requirements. Below is an example of a sample coupon that was coated with a polyurethane on one side and a fluoropolymer on the other, and placed in the QUV chamber for 10,000 hours (mocking 10 years in service). As you can see, the fluoropolymer is performing at a much higher level.
The QUV test is important because it provides a reliable and efficient means of evaluating the long-term durability and performance of coatings in a relatively short period of time. By subjecting coatings to accelerated weathering conditions, manufacturers, contractors, and end-users can assess their ability to resist fading, cracking, chalking, peeling, and other types of degradation.
In addition to helping identify potential issues with coatings, the QUV test can also be used to compare the performance of different coatings and formulations, helping to inform product selection and development. Ultimately, the QUV test plays a critical role in ensuring that exterior coatings are able to provide the necessary protection and aesthetic appearance over the expected service life of the coated surfaces.
For exterior exposure, there are many options, for example, acrylic's like Series 1029 or polyurethane's like Series 1095 or fluoropolymer's like Series 1070. And, the color alone may be the limiting factor for performance, depending on the end-use conditions. Contact a High Performance Coating Consultant for more information. We can help determine which coating system may be best for your specific project.
Check out these additional resources
Accelerated Weathering ASTM D4585
What Architects Should Consider When Specifying High Performance Coatings
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