AATCC 116 Colorfastness to Crocking (Rotary)

Purpose of Test

The colorfastness to rotary vertical crocking test method is designed to determine how much color is transferred from a colored textile to other surfaces. 

This test method was designed for textiles made from various fibers and with various coloring types:

  • Yarn
  • Other Fabrics
  • Dyed
  • Printed
  • Other Coloring Techniques

This method allows the testing of samples that are too small for the normal crocking test.

A vertical rotary crockmeter (Image Source: sdlatlas.com)

Terminology Defined

Colorfastness – Colorfastness is a fabric’s ability to retain color in various conditions.

Crocking – Crocking refers to the rubbing off of color from a fabric when subjected to abrasion.

Chromatic Transference Scale – The Chromatic Transference Scale is used to visually evaluate color transfer or staining during testing. The scale has multiple hues that allow a tester to match a hue from a color transfer test to a numerical score. 

Gray Scale for Staining – The Gray Scale for Staining is used in colorfastness tests for evaluating staining on undyed textiles. The scale has shades of gray correlated with numbers that allow a tester to match shades with a numerical score.

Instrumental Assessment of Degree of Staining — An alternative to the visual method of assessing staining.

AATCC 9-Step Chromatic Transference Scale (Image Source: aatcc.org)

Test Method

Materials Used for Test

White test cloth squares

  • Dry
  • Wet with water

Testing Procedure+

Timing of Test – the colorfastness to crocking test may be performed before or after any of the following:

  • Washing 
  • Drycleaning 
  • Shrinkage 
  • Ironing 
  • Finishing
  • Any other relevant cleaning or finishing treatments

Test Procedure (Summary)

Part 1: Rub Test – The textile being tested is held against the Rotary Vertical Crockmeter and rubbed with a white crock test cloth under controlled conditions.

Part 2: Assessment & Grading – Color transferred to the white test cloth is evaluated by comparing it with one of the following options: 

  • The Gray Scale for Staining,  
  • The Chromatic Transference Scale, or
  • The Instrumental Assessment of Degree of Staining

A grade is assigned and evaluated against an acceptable quality limit.

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