INDUSTRIAL AND LABORATRIES CHEMICALS
Veslic Rub Fastness Tester
|Diameter of the finger||16 mm|
|Load on the finger||150 g (force of 0.075 kgf / cm2)|
|Length of travel of the finger||100 +- 12 mm|
|Dimensions of the test specimen||125*50 mm|
One of the tests for determination of colour fastness of dyed leather is the crocking test. This test is used for the determination of colourfastness against rubbing, either under dry or under wet conditions. In this test a moving brass finger of specified shape and size rubs against the test specimens under a fixed load. The amoto a piece of abunt of colour lost by the sample under test and the amount of colour transferred radant fabric fixed over the base of the moving finger are graded with the help of standard grey scales to evaluate the colour fastness against rubbing.