AATCC 169:2017 pdf download.Weather Resistance of Textiles: Xenon Lamp Exposure
5. Uses and Limitations
5.1 Results obtained by this test method should not he considered equivalent to those results obtained by weathering in an outdoor environment unless a mathematical correlation for a given material has been established and agreed upon by the contractual parties. Outdoor environments vary with respect to season. geography and topography and, as a consequence, the effects of outdoor exposure will vary accordingly. Not all materials are affected equally by the same environment. The instruments for determining weather resistance described in this test method arc considered satisfactory, since they have been used extensively in the trade for acceptance testing of textile materials. The decision as to which machine type to use should be agreed upon by the purchaser and supplier based on their historical data and experience. There may be distinct difference in spectral distribution, water spray application, air and humidity sensor location, and test chamber size between weathering test machines supplied by different manufacturers that can result in differences in reported test results. (‘onsequently, data obtained from machines supplied by different manufacturers and different size test chambers and xenon lamps cannot be used interchangeably unless a mathematical correlation has been established and agreed upon. No comparison between differently manufactured test apparatus is known to AATCC Committee RA5O using this test method.
5.2 When using this test method, the contracting parties must agree upon a reasonable test program cycle incorporating light, temperature, humidity, and wetting effects. The cycle selected must reflect expected environmental conditions relative to season, geography, and topography associated with the use of the material (see Option 1, 7.2.1).
5.3 When using this test method, use a standard of comparison (such as a weathering reference material or other control specimen), which has a known change in property value after a specific exposure.AATCC 169 pdf download.