Colour fastness to Rubbing/crocking Test Procedure

Evaluates the degree of colour transfer from the textile surface to other surface.
Test Method:BS EN ISO 105 X12 & AATCC 8

Preparation of the samples

• the sample has to be tested in the delivered condition; don’t wash and/or tumble it before testing
• the fabric/sample has to be air conditioned at least 8 hours by standard climate (20°C / 65% relative humidity)
• the air conditioned specimen has to be rubbed with the dry and wet cotton rubbing cloth in warp, weft or diagonal direction on face side. The test direction has to be noted in the test report.
• use always cotton test material from James Heal (Cotton Rubbing cloth ISO 105 F09)
• for a correct test result the rubbing point on cotton must show an even staining with an exact circle

Apparatus – Crock meter

Crock meter
Colorfastness to Rubbing process:
rubbing process 1
crocking problems

 

crocking step 1

 

 

 

 

 

 

 

The rubbing finger with the rubbing cloth is moved to and from along a 10 cm track on the red colored test specimen, exerting a downward force of 9 Newton.
crocking step 2

 

 

 

 

 

 

 

The non colored rubbing cloth is wetted with water for performing the wet
rubbing test.
crocking step 3
The trace of the wet rubbing cloth can be seen during performance of the wet rubbing test.

Assessment of the specimens
• the assessment has to be done independently of 2 persons; take the average as result
• the assessment (E) has to be done with
• 1) defined grey scale
• 2) grey frame in same grey colour as background
• 3) white paper as background or according to the test method one or more original multifibre to assure no transparent effect coming out of the background
• under defined light D65 with defined angle of 45°
crocking step 4
For assessment of color staining, using the “Grey Scale”, this light box is used in a darkened room.

rubbing assessment
Assessment of color staining of the rubbing cloth after wet rubbing.The scale with fastness grades 1 to 3 of the nine step scale is applied.

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