What is the crockmeter? How to use it?


Color and brightness of the textile is an important factor and also influences great significance for ecological textiles.

The crock meter test is used to check the fastness of a textile when it is subjected to dry or wet rubbing. This tester can be used on various textile materials such as fabric, carpets, yarn, leather and other textiles. This electronic Crockmeter complies with ISO 105*12/D02, AATC 8/165, BS 1006-D02. Crockmeter is useful for Crockmeter test and the price of Crockmeter is very competitive in the textile testing market.


Features of a Crockmeter equipment


1. A counter is attached with the Crockmeter to read the ratings

2. It is manually chargeable

3. Crocking fingers are provided by this crocking test machine

4. It gives quick and accurate results.


Crockmeter and Crocking test


An average friction is determined by conditions specified in the friction test machine, which is called Crockmeter. This rub test machine can be characterized into motorized Crockmeter and manual Crockmeter.


The crocking test verifies the bleeding feature of the textile.


In Crocking test, a standard white cloth, either dry or wet, is attached to the friction head. Under a certain amount of friction, the dyed samples subsequently emitted a certain amount of chemicals.

Friction from the attached white cloth is tested a specified number of times.

For the dry sample, the color transfer to the white cloth can be compared with the staining gray sample card.


Colorfastness level is calculated by the color transfer sample card to assess the degree of loss in the color fastness.


Crockmeter test method


The rubbing direction of the crock meter test cloth is parallel to the length direction of the rubbing cloth.


For the dry crocking test procedure


A dry piece of Crockmeter test cloth is placed under the plate of the rubbing test machine. Using the crock meter white cloth perform at least 10 cycles of rubbing on the material under test. The shade effect of the color of the testing material is spread on the white crock meter cloth and then the color fastness is measured by the grey scale and the rating is allocated.


For the wet crocking test procedure


The testing procedure for a wet cloth is same as the dry crocking procedure only except that the crock meter cloth is wet with one drop of distilled water. None of the test procedure is changed in the wet crocking test procedure except for the test cloth material.


Working procedure of Crockmeter on how to use a Crockmeter


1. Crockmeter tester is equipped with a platform on which the test cloth material is firmly placed on and the crocking finger is rubbed against the test material cloth under a specific load.

2. The platform lies in a horizontal plane. The finger has a flat circular rubbing face on which the standard white cloth is attached.

3. The white cloth picks up the color lost by specimen under test during friction.

4. The motion of the finger is given through a reciprocating arm to apply constant and uniform friction.

5. The arm is moved by a manually operated crank and connecting line.


Test analysis


1. Dry rubbing is better than wet friction.

2. Dry light-colored fabric exposed to wet friction holds better color fastness levels.

3. The dry and wet friction of flocking are generally the same. Different test methods do not have any effect on the test results.

4. Moist wool fabrics and pure polyester fabrics have better color fastness than dry’s fabrics.

5. Under different friction methods, the fabric structure makeup also has a certain impact.

6. Velvet fabrics are basically the same under different friction test methods.

7. For the same sample size, almost same friction test data was obtained. There will be a difference of 0.5 to 1.0, for the relative grades of the Japanese standard are slightly lower. The test data vary based on different standards and is slightly higher for American standard.


The rubbing colorfastness test is one of the basic test items of textile colorfastness test. It is found that type of test specimen, the type of standard friction white cloth, the moisture content of the white and the test parameters such as temperature, humidity, vertical pressure, friction intensity and rubbing direction all have a certain influence on the test method.


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