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Saturday, 2 March 2013

Color Fastness to Rubbing

Color fastness is the test that designed to determine the degree of color which may be transferred from one surface to another test specimen by rubbing (Both wet and dry).

There are two methods for Rubbing fastness.


  1. ISO-105-X12
  2. AATCC-08
In ISO-105-X12 the wet pickup of the rubbing cloth is 100%. In AATCC-08 the wet rubbing cloth will be 65% also we check rubbing in Dry cloth. In wet rubbing the wet the cloth as per the test method and give rating with the help of Gray scale. Similarly for dry rubbing we test the specimen by rubbing and then compare the staining and give dating with the help of grey scale.

     Color fastness to rubbing is the main test which is always required for every dyed or printed fabric. If the color fastness to rubbing result is good then its other properties like washing fastness and durability improves automatically because the rubbing is the test which test the fixation of color on a fabric.

      Generally rubbing fastness depends on "Nature of fabric color" and " Depth of the color".

Construction of the fabric nature is also plays a important role in Rubbing test. Like Pigment, Disperse, Direct has its own fastness properties to rubbing. There are few dark colors like Black, Navy, Red, Burgundy, Royal blue which have very poor fastness properties because of the chemical structure. Like black color is a carbon base color and the particle carbon size is larger than the other colors so the rubbing fastness is poor. Same for Red, Navy and blue colors also.

So, to improve the fastness more binder is added to improve the fastness of these colors. It doesn't mean that we cant able to improve the fastness to these colors. the required result can be achieved but the production cost will increase. On the other hand the construction of the fabric also gets effects the fastness properties.

The result we can get normally are like below.

                    Light colors                         Medium colors                           Dark colors
Dry                   5                                               4                                        3-4 & 4
Wet               4 & 4-5                                        3                                        2 & 2-3

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