Determine the resistance of the colour of textiles of all kinds, including textile floor coverings and other pile fabrics, to rubbing off and staining other materials.
Apparatus required:
- Crockmeter, which has the following standard features: The rubbing finger must comprise of a cylinder with a diameter of 16 mm. The finger must move to and fro in a straight line along a 100 mm track on the tested sample and exert a downward force of 9N (920 g).
- Cotton rubbing fabric, complying with ISO 105-F, Section F09, desized, bleached, without finish, cut into squares measuring 50 mm x 50 mm.
- Distilled water
- Grey scale ISO 105 - A03 to determine staining to the cotton rubbing fabric.
- Standard illuminant D65
Procedure:
- Take one piece of the standard cotton rubbing fabric and mount it over the rubbing finger by using the provided clamp. (For each test a new standard rubbing fabric must be used.)
- Fasten the test specimen with the clamps at the bottom plate of the Crockmeter.
- Before carrying out the wet rub test, ensure that the standard cotton fabric has absorbed 100% of its own mass with distilled water.
- Lower the rubbing finger with the standard cotton fabric on to the fabric to be tested (which is now attached at the bottom plate of the Crockmeter). Turn the Crockmeter 10 complete turns, at a rate of one turn per second. A stopwatch is recommended for accuracy.
- After the test, the wet cotton rubbing fabric should be dried at room temperature, or in the drying cabinet at temperature not exceeding 60 °C.
- The test should be carried out both in the length and width direction of the test.
Evaluation:
Staining of the cotton rubbing fabric must be evaluated under the standard illuminant D65 by using the grey scale ISO 105-A03 for staining.
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