The lightfastness testing standard for digitally printed fabrics is to ensure that the color and performance of the fabric will not change significantly after being exposed to sunlight for an extended period of time. The following are several common lightfastness testing standards:
GB/T22771-2008
This is a national standard in China for evaluating the lightfastness of printed matter and printing inks using filtered xenon arc lamps in printing technology. In this standard, the test sample and the blue wool standard sample are exposed under a xenon arc lamp at the same time, and the lightfastness is evaluated by finding a grade in the grade of the blue wool standard sample that is similar to the change in the test sample.
ASTM D6901
This is the American Society for Testing and Materials standard for lightfastness testing of colored pencils. This standard specifies minimum lightfastness levels based on exposure to xenon lamps for specified times.
DIN ISO 12040
This is a standard published by the German Standardization Institute that provides guidance for the evaluation of the lightfastness of prints and printing inks using filtered xenon lamps.
The above are some common standards for lightfastness testing of digitally printed fabrics. Different standards may have different test conditions and evaluation methods, so when selecting a test standard, you need to make a selection based on specific usage requirements and fabric type.