Test Principle

Use a prescribed felt to perform a reciprocating friction test on one surface of the leather under the specified pressure, and test the specified number of times. Compare the color changes of felt surface and leather surface with gray sample card to determine the grade and record any visible change or damage to the leather surface. The instrument is suitable for all kinds of leather.

Test Steps (Standard QB / T 2537)

1 Cut the sample according to the standard, and adjust it.

2 Fix the air-conditioned specimen on the test table and draw 10% along the friction direction. If the specimen cannot stretch 10%, stretch the specimen to the maximum allowable elongation. If the sample is not stable during friction after 10% elongation, continue to stretch the specimen until the specimen cannot be elongated. Record the above two cases in the test report.

3 Test the general leather sample, loading load, so that the total weight of the test head is 1000g. Suede leather and similar leather, due to the effect of larger friction, the test load is not loaded, the total weight of the test head is 500g.

4 Fasten the prepared test felt to the test head so that the test head is in horizontal contact with the leather sample. Then set the friction times and start the friction test.

5 After the test, remove the sample and felt, evaluate the color change of the friction part of the sample and the contamination of the felt. Record the test results.

How to Ensure the Accuracy of the Test Results of the Color Fastness to Rubbing?

1 Before testing, we should carefully check whether the friction surface of the friction head is smooth, otherwise, the stain on the friction cloth will appear abnormal phenomena of different colors inside and outside.

2 It must be reliable and cannot be loosened when the friction cloth is fixed on the friction head, otherwise, the color spot of the friction will not be round.

3 The surface of the friction head should always be in relatively parallel contact with the surface of the specimen. When the friction head is improperly installed or the thickness of the specimen varies greatly, both contact surface will be changed. At this time, the grommets on the friction head should be appropriately increased or decreased to adjust the position of the friction head.

4 When the friction cloth is fixed on the friction head, the friction head should be carefully placed on the specimen so as not to increase the stain degree accidentally. This is especially true for wet friction tests.