AATCC 133:2020 pdf download.Test Method for Colorfastness to Heat: Hot Pressing
14.2 For potential apparatus, reagents or materials sources, visit the AATCC Buver:c Guide at www. aatcc.org/bg. AATCC provides its Corporate members the option to list their items and services. AATCC does not qualif’, or in any way approve, endorse or certif’ that any of the listings meet the specifications in its standards.
14.3 To obtain the pressure per unit area 40 ± 10 g/cm2 the total area of the wool flannel padding should bear a suitable relationship to the mass of the plate pressing down on the padding. If the fabric to be tested has an appreciable thickness, it is necessary either to increase the area of the test specimen or to augment the pressure-bearing surface using a suitable template made from the same material as the test specimen, lithe plates of the heating device are smaller than the specimen she, the pressure depends on the design of the apparatus (ratio of mass and area of top plate).
14.4 For less critical testing, a householdiron may be used: but its temperature should be measured with a surface pyrometer or with temperature sensitive papers. The iron should be weighted so that its area and total weight are in the approximate ratio to exert a pressure of 40 ± 10 g/m2. However, due to temperature tiuctuation during on-off differences over the iron surface, the accuracy and reprxlucibility are limited. When a hand iron is used, it must be stated in the report.
14.5 The heat resistant sheet is used for insulation and should be smooth and not warped. It is best to complete specimen assembly on the heat resistant sheet before placing it on the heating device. This insulating material must be used, whether the bottom plate is heated or not, to prevent heat to or from the bottom of the test assembly.
14.6 The pressing temperature selection depends to a large extent on the type of fiber and on the construction of the fabric or garment. In the case of blends, use the temperature appropriate to the fiber with the lowest heat resistance.
14.7 For very critical evaluations and in the case of litigation, ratings must be based on the geometric Gray Scale for Staining or the instrumental equivalent.
14.8 CAUTION: It has been reported that the results for staining obtained by this method on fabrics dyed to dark shades (navy, black, etc.) that contain a combination of polyester and spandex. or their blends. may not show the full staining propensity of such fabrics in consumer use. It is, therefore, recommended that the staining results obtained by this test not be used for the acceptance testing of such fabrics.AATCC 133 pdf download.