AATCC 133-1999 Colorfastness to Heat: Hot Pressing

AATCC 133-1999 Colorfastness to Heat: Hot Pressing. 2. Principle 2.1 Dry Pressing. The dry specimen is pressed with a heating device of a speci- fied temperature, time and weight. 2.2 Damp Pressing. The dry specimen is covered with a wet, undyed cotton cloth and pressed with a heating device of a specified temperature, time and weight. 2.3 Wet Pressing. The wet specimen is covered with a wet, undyed cotton cloth and pressed with a heating device of specified temperature and weight. 3. Terminology 3.1 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 a result of the exposure of the material to any environment that might be encountered during the processing, testing, storage or use of the material. 3.2 hot pressing, n.—a process for smoothing and possibly shaping textile products by applying mechanical pres- sure with heat, either dry or in the pres- ence of moisture. 4. Safety Precautions NOTE: These safety precautions are for information purposes only. The pre- cautions are ancillary to the testing procedures and are not intended to be all inclu- sive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufac- turers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommenda- tions. All OSHA standards and rules must also be consulted and followed. 4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas. 5. Apparatus and Materials 5.1 Heating device, providing even heat transfer to the specimen from the top by close contact at a controlled tempera- ture (see 7.1, 12.1, 12.2 and 12.5) and giving a pressure on the specimen of 40 ± 10 g/cm 2 (see 12.4). 5.2 A smooth heat resistant sheet (see 12.3 and 12.9). 5.3 Wool flannel of approximately 260 g/m 2 (see 12.4). Two layers of this mate- rial are used to make a pad of approxi- mately 3 mm thickness. Similar, smooth wool fabrics or felt to give a pad about 3 mm thick could be used. 5.4 An undyed, bleached and not mer- cerized cotton cloth, with a smooth sur- face 100-130 g/m 2 . 5.5 Gray Scale for Color Change (see 12.8). 5.6 Gray Scale for Staining (see 12.8). 5.7 AATCC Chromatic Transference Scale (see 12.8). 6. Test Specimen 6.1...