| Résumé : |
The primary stress factors of heat, light and moisture, in weathering testing.
Basic firefighter training begins with learning the 'fire triad'. Fire requires three elements : fuel, oxygen and an ignition source and the trainees then learn about each in detail. And it is useful in weatherability testing to periodically review the basics as well. The 'weathering triad' consists of the primary stress factors of heat, light and moisture, so have there been any recent advances regarding these three factors in weathering testing techniques or equipment ?
The four main weathering testing techniques (apart from corrosion) are natural outdoor exposures (such as South Florida), accelerated outdoor exposures (eg Emmaqua solar tracking/concentrators) and laboratory accelerated artificial weathering using UV fluorescent lamps with moisture (UVTest) or full solar spectrum xenon arc (Weather-Ometer, Xenotest, Suntest) with controlled temperature and moisture. Of course, each has specific pros and cons regarding cost, time, predictive ability, etc. |
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Understanding the weathering triad in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 201, N° 4562 (07/2011)
