All textile producing companies sometimes carry out numerous tests to improve the quality of their products and create customer satisfaction in the laboratories they create in their own environments, but in many times accredited laboratories. An important part of these tests is fastness tests. Fastness tests are carried out to determine the resistance of dyes on textile products to various factors encountered during production and usage stages. In short, depending on the properties of the textile products to which the dyes are applied and different factors such as light, sweat, heat and water, the fastness assessments also differ.

As such, some fastness values ​​of some textile products may be high, while some fastness values ​​may be low. For example, some of the textile products may have low fastness to washing, whereas the fastness to dry cleaning may be high. Of course, the dyeing methods used as well as the type of dyestuff used and the fiber type of the yarn are effective. For example, the darkness of the applied paint may also give different fastness values. In a very dark dyeing, light fastness is better than dyeings made using less amount of the same dyestuff.

Some textile products should have high fastness to high temperatures. There should be no loss of color, especially in ironing applications made with hot press and should not create contamination in the color of adjacent material by spreading paint with the effect of heat. The hot press fastness is made to determine these properties of textile products. These test results are evaluated using the gray scale used in the fading assessment to determine color change (TS 423-2 EN 20105-A02).

In addition, authorized laboratories determine the fastness of hot press in accordance with the following standards:

• TS 472 EN ISO 105-X11 Textile color fastness tests - Part X11: Determination of color fastness to hot pressing
• AATCC 133 Color fastness to heat: Hot press