This standard specifies a method for determining the resistance of the colour of textiles of all kinds, The method is applicable to textiles made from all kinds of fibres in the form of yarn or fabric. Two tests may be made, one with a dry rubbing cloth and one with a wet rubbing cloth.
Specimens of the textile are rubbed with a dry rubbing cloth and with a wet rubbing cloth. The machine provides two combinations of testing conditions through two alternative sizes of rubbing finger: one for pile fabrics and one for solid colour or large print fabrics.
- Suitable testing device for determining the colour fastness to rubbing, using a reciprocating straight line rubbing motion and two alternative sizes of rubbing fingers.
- For textiles: rubbing finger comprised of a cylinder of (16 ± 0,1) mm diameter moving to and fro in a straight line along a (104 ± 3) mm track on the specimen and exerting a downward force of (9 ± 0,2) N.
- Cotton rubbing cloth,
- Soft-back waterproof abrasive paper
- Grey scale
If the textile to be tested is a fabric or textile floor covering, two pieces not less than 50 mm × 140 mm
are required for dry rubbing and two for wet rubbing. Additional specimens may be used when higher precision is needed. One specimen of each pair shall have the long direction parallel to the warp yarns (or in the direction of manufacture), the other parallel to the weft (or filling yarns or at right angles to the direction of manufacture). An alternate method of cutting specimens is to cut the long dimension diagonally to warp and weft. If the pile lay of a carpet specimen is distinguishable, cut the specimen with the pile lay pointing in the long direction.
If the textile to be tested is yarn or thread, knit it into fabric to provide specimens at least 50 mm × 140 mm or form a layer of parallel strands by wrapping it lengthways on a cardboard rectangle of suitable dimensions. Before testing, condition the specimen and rubbing cloth for at least 4 h in the standard atmosphere as defined in ISO 139. For best results, testing should be conducted under standard atmosphere for testing textiles (see ISO 139).
Fasten each test specimen by means of clamps to the baseboard of the testing device so that the long direction of the specimen follows the track of the device. Between the baseboard of the testing device and the specimen, place a piece of wire mesh or soft-back waterproof abrasive paper to help reduce movement of the specimen. When testing multi-coloured textiles, care should be taken to position the specimens in such a way that all colours of the design are rubbed in the test using the device. Alternatively, if the areas of colour are sufficiently large, more test specimens may be taken and the individual colours assessed separately. If the areas of colour are small and run together, a choice to test using a rotary device, as described in ISO 105-X16, is advised.
Place the conditioned rubbing cloth flat over the end of the finger with the weave parallel to the direction of rubbing finger. At a rate of one cycle per second, rub to and fro in a straight line 20 times, 10 times to and 10 times fro, along a track (104 ± 3) mm long on the dry specimen, with downward force of (9 ± 0,2) N. Remove test square and condition as in Remove any extraneous fibrous material that might interfere with the rating.
Establish a technique for preparing rubbing cloth by weighing a conditioned piece of cloth, then thoroughly soak in distilled water and reweigh to ensure take-up of 95 % to 100 %. Follow the instructions for rubbing as stated.
Air dry the test cloth.
Back each tested rubbing cloth with three layers of white rubbing cloth while evaluating. Assess the staining of the cotton rubbing cloths with the grey scale for staining under suitable illumination (see ISO 105-A01:2010).
The test report shall contain the following information:
Whether dry or wet rubbing was performed along with the percentage of soak;
The time of conditioning of the specimens and rubbing cloth as well as the atmospheric conditions
The numerical rating for staining for each test specimen.