AATCC 169-2020 Test Method for Weather Resistance of Textiles: Xenon Lamp Exposure. 4. Terminology 4.1 breaking strength, n.— the ability or capacity of a specific material to with- stand the ultimate tensile load or force re- quired for rupture. (ASTM D123). 4.2 bursting strength, n.—the force or pressure required to rupture a textile by distending it with a force, applied at right angles to the plane of the fabric, under specified conditions. (ASTM D3786, D3787). 4.3 colorfastness, n.—the resistance of a material to change in any of its color characteristics, to transfer of its colorant(s) to adjacent materials, or both, as the result of exposure of the material to any environment that might be encountered during processing, storage, use or testing of the material. 4.4 irradiance, n.—radiant power per unit area as a function of wavelength ex- pressed as watts per square meter, W/m 2 . 4.5 irradiation, n.—the time integral of irradiance expressed in joules per square meter (J/m 2 ). 4.6 radiant energy, n.—energy travel- ing through space in the form of photons or electromagnetic waves of various lengths. 4.7 radiant flux density, n.—rate of flow of the radiant energy past the specimen. 4.8 radiant power, n.—energy per unit time emitted, transferred, or received as radiation. 4.9 spectral energy distribution, n.— the variation of energy due to the source over the wavelength span of the emitted radiation. 4.10 spectral transmittance, n.—the percent of incident radiant energy passing through a given material and not ab- sorbed in the process, as a function of wavelength. 4.11 standard atmosphere for test- ing, n.—in textiles, an atmosphere for testing in which the air is maintained at a relative humidity of 65 ± 2% and at a temperature of 21 ± 1°C (70 ± 2°F). (ASTM D123) 4.12 tearing strength, n.—in fabrics, the capacity of a material to withstand the ultimate tearing force required to propa- gate a tear after its initiation. (ASTM D1424, D2261, D5587, D5034) 4.13 total irradiance, n.—radiant power integrated over all wavelengths at a point in time expressed in watts per square meter (W/m 2 ). 4.14 weather, n.—climatic conditions at a given geographical location, includ- ing such factors as sunlight, rain, humid- ity, and temperature. 4.15 weather resistance, n.—ability of a material to resist degradation of its properties when exposed to climatic conditions. 5. Safety Precautions 5.1 The safety precautions specified in the method/procedure are ancillary to the...
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