AATCC 181:2004 pdf download.Colorfastness to Light at High Temperatures: Daylight Temperature and Humidity Controlled Apparatus
1.1 This test method specifies the oper- ating procedures for the exposure of auto- motive interior trim materials in an out- door behind-glass apparatus in which the temperature is controlled in a 24 h cycle. The humidity is controlled during the dark(night) portion of the cycle.
1.2 Specimen preparation, test durations and performance evaluation procedures are covered in material specifications of the different automotive manufacturers.
2. Principle
2.1 Samples of the textile material to be tested and the agreed upon comparison standard(s) are exposed simultaneously under specified conditions designed to accelerate the amount of irradiance im- posed upon the specimens. The amount of exposure is determined with respect to a specified degree of color change, or al- ternately to a specific amount of radiant energy. The colorfastness of the specimen is evaluated by comparison of the color change of the exposed portion with the masked control portion of the test speci- men or unexposed original material, us- ing the Gray Scale for Color Change or by instrumental color measurement.
3. Terminology
3.1 black panel thermometer, n.—a temperature measuring device, the sens- ing unit of which is coated with black de- signed to absorb most of the radiant en- ergy encountered in lightfastness testing.
3.2 blue wool lightfastness standard, n.—one of a group of dyed wool fabrics which are sensitive to the amount of light, heat, and moisture to which they are exposed.
NOTE: Because of the unstable nature of these materials they are also sensitive to the heat and moisture conditions which exist before exposure testing, after expo- sure testing and prior to measurement.
3.3 color change, n.—as used in col- orfastness testing, a change in color of any kind (whether a change in hue, satu- ration or lightness).AATCC 181 pdf download.