GB/T 40264-2021 in English

Interpretation of the core content of the standard

This standard specifies the test method for the color fastness of textiles in a simulated urine environment, and is applicable to the quality inspection of various textile products. The test principle is: after the sample is combined with the standard adjacent fabric, it is treated with artificial urine and applied with a pressure of (12.5±0.9)kPa, and maintained at a constant temperature of (37±2)℃ for 4 hours, and finally the color change/staining level is evaluated by visual inspection or instrumentation.

Comparison of key technical parameters

Equipment and material specifications

Test equipment required: Test device (including 5kg weight), Constant temperature box, standard lining fabric in accordance with GB/T7568 series. The artificial urine formula contains 7 ingredients including urea and sodium chloride, which need to be prepared and used immediately.

Key points of sample preparation

• Fabric sample: 40mm×100mm sample is sewn with adjacent fabric
• Yarn sample: take half the mass of adjacent fabric
• Printed fabric: make sure all colors are included

Detailed explanation of operation process

1. Impregnate the sample in artificial urine for 30 minutes (bath ratio 50:1)
2. Remove excess test solution and place in test device
3. Pressure treatment at 37℃ for 4 hours
4. Air drying below 60℃
5. Rating using GB/T250/251 grey scale or spectrophotometer

Implementation suggestions

Troubleshooting