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Defining accelerated weathering

Miscellaneous | September 1, 2009 | By:

Question: The sales literature on the boat cover fabric I’m thinking of using has information on something called accelerated weathering. What’s that and how does it relate to how long the fabric will last?

Answer: Assessing how a fabric is going to perform outdoors is a tricky business. Not only is there sunlight damage to consider, but also potential damage from rain and atmospheric pollutants. If you’ve been in the trade for a while, you probably have a feel for how the fabrics you primarily use are going to weather. If you’re considering a new fabric, however, you’ll have to rely on information provided by the manufacturer or test the material yourself.

There are two basic ways to test the weatherability of fabric: direct weathering and accelerated weathering. Direct weathering is real time testing. As the name implies, a fabric is placed outside under very specific conditions and its performance is measured. This type of testing uses real-world conditions, but it takes time. Years, even. Accelerated weathering takes place in equipment that has been designed to simulate outdoor conditions, but at a pace that is sped up. Accelerated weathering is much faster than direct weathering.

To make the matter more complicated, different types of equipment use different light sources, which are carbon arc, xenon arc and fluorescent UV, and have different ways of simulating rain. These can affect the outcome of the test. In the United States, the American Society for Testing and Materials and the American Association of Textile Chemists and Colorists are the primary writers of weathering testing.

What does this mean to you as a fabricator? It can be difficult to correlate an accelerated weathering test to an anticipated lifetime of a fabric, although that is something you can get a feel for the more you work with the various testing methods. Be assured, though, that this is something your supplier is aware of and is likely factoring into the warranty of its products. Large shops that are OEM suppliers might be involved in testing. For most shops, however, it should be enough to be aware that there are different types of accelerated weathering tests and to make the most accurate evaluation, making sure that the fabrics you are comparing have gone through the same kind of tests.

SOURCE American Society for Testing and Materials, West Conshohocken, Pa., 800 262 1373

SOURCE American Association of Textile Chemists and Colorists, Research Triangle Park, N.C., +1 919 549 8141

Juli Case is IFAI’s information and technical services manager.

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