1. T-shirt lightfastness
Lightfastness refers to the degree of discoloration of colored fabrics by sunlight. The test method can be either in sunlight or in a daylight machine. The degree of fading of the sample after exposure is compared with the standard color sample, and it is divided into 8 levels, 8 is the best, and 1 is the worst. T-shirts with poor lightfastness should not be exposed to the sun for a long time and should be placed in a ventilated place to dry in the shade.
2. Washing fastness of T-shirts
Washing or soaping fastness refers to the degree of the color change of dyed T-shirts after washing with washing liquid. Usually, the gray graded sample card is used as the evaluation standard, that is, the color difference between the original sample and the faded sample is used for judgment. The washing fastness is divided into 5 grades, grade 5 is the best and grade 1 is the worst. T-shirts with poor washing fastness should be dry-cleaned. If they are wet-washed, the washing conditions should be paid extra attention, such as the washing temperature should not be too high and the washing time should not be too long.
3. Rubbing fastness of T-shirts
Rubbing fastness refers to the degree of discoloration of dyed T-shirts after rubbing, which can be divided into dry rubbing and wet rubbing. The rubbing fastness is evaluated based on the degree of white cloth staining, and it is divided into 5 levels (1~5). The larger the value, the better the rubbing fastness. The service life of T-shirts with poor rubbing fastness is limited.
4. T-shirt sweat fastness
Perspiration fastness refers to the degree of color fading of a dyed T-shirt soaked in sweat. The perspiration fastness is not the same as the artificially prepared sweat composition, so it is generally evaluated in combination with other color fastnesses in addition to a separate measurement. The perspiration fastness is divided into 1~5 grades, the larger the value, the better.
5. T-shirt ironing fastness
Ironing fastness refers to the degree of discoloration or fading of dyed fabrics during ironing. The degree of discoloration and fading is evaluated by the iron staining of other fabrics at the same time. Ironing fastness is divided into grades 1 to 5, with grade 5 being the best and grade 1 being the worst. When testing the ironing fastness of different T-shirts, the temperature of the iron used for the test should be selected.
6. T-shirt sublimation fastness
Sublimation fastness refers to the degree of sublimation of dyed T-shirts during storage. The sublimation fastness is evaluated by the gray graded sample card for the degree of discoloration, fading, and staining of the white cloth after the dry hot pressing treatment. There are 5 grades, 1 is the worst, and 5 is the best.
