This standard specifies the test principle, instrument, test piece, operation and test report for the water fastness of colored leather. This standard is applicable to the water fastness test of colored leather. QB/T 1808-1993 Test method for water fastness of colored leather QB/T1808-1993 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Test method for water fastness of colored leatherbzxz.net
1 Subject content and scope of application
This standard specifies the determination principle, instrument, test piece, operation and test report of water fastness of colored leather. This standard is applicable to the determination of water fastness of colored leather. 2 Reference standards
GB/T251 Grey scale for assessing staining
GB/T7565 Textiles - Test for color fastness - Cotton and viscose standard interlinings 3 Principle
QB/T1808—1993
The grain side and flesh side of the colored leather test piece are attached to the white cotton standard interlining and soaked in distilled water. After 15 minutes, the test piece and the stained white cotton standard interlining are dried separately. Observe the color change of the grain side and flesh side of the test piece and use the grey scale for assessing staining to identify the staining grade of the white cotton standard interlining.
4 Apparatus
4.1 The area of ​​the flat bottom is larger than 5cm×5cm. 4.2 Polished glass sheet: 5cm×5cm or slightly larger, weighing (50±1)g. 4.3 White cotton standard backing: two pieces of 5cm×5cm, in accordance with the provisions of GB/T7565. 4.4 Grey card for staining assessment: in accordance with the provisions of GB/T251. 4.5 Oven: maintained at (37±2)℃.
5 Test piece
Place the 5cmX4cm test piece to be tested between two pieces of white cotton standard backing, so that the white cotton standard backing does not overlap with the test piece at 5cmX1cm, and sew the shared 5cm side together to form a combined test piece. 6 Operation
Place the combined test piece flat on the flat bottom, immerse it in distilled water, cover it with a glass plate, and press it evenly by hand to remove air bubbles, and place it in the room for 15 minutes.
Pour out the water without removing the glass plate, and place in an oven at a temperature of (37±2)℃ for 4h. Separate the test piece from the white cotton standard interlining, and dry them separately at room temperature. Observe the color change of the grain surface and flesh surface of the test piece, and use the gray scale for staining assessment to identify the staining grade of the white cotton standard interlining that is attached to the grain surface and flesh surface of the test piece. 7 Test report
The test report includes the following contents:
7.1 Color change of the grain surface and flesh surface of the test piece
The Ministry of Light Industry of the People's Republic of China approved the use of QB/T 1808---1993
The staining grade of the white cotton standard interlining that is attached to the grain surface and flesh surface of the test piece. 7.2
Additional Notes:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Fur Leather Standardization Center. This standard was drafted by the Fur Leather Industry Scientific Research Institute of the Ministry of Light Industry. The main drafters of this standard are Xue Juntian and Li Ying. 110
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