Color Fastness to Rubbing Testing for Dyed Textiles: Standards, Methods, and Evaluation

Color fastness to rubbing testing measures the resistance of dyes and prints on textile surfaces to transferring onto adjacent materials under dry or wet friction, making it one of the most frequently performed fastness tests in textile quality control. This article explains the test principle, applicable international standards such as ISO 105-X12, AATCC 8, AATCC 165, and GB/T 3920, sample requirements, step-by-step procedures, grading criteria, and practical applications for dyed and printed textiles.

Technical Overview

Color fastness to rubbing, also known as crocking fastness, evaluates the ability of a dyed or printed textile to resist the transfer of color to an adjacent surface when subjected to mechanical rubbing. During everyday use, garments, upholstery, and other textile products are constantly in contact with other materials through abrasion, body movement, and pressure. Poor rubbing fastness causes dyes to stain lighter-colored adjacent fabrics, linings, skin, or furniture, resulting in quality complaints, product returns, and potential non-compliance with safety regulations.

The test is performed in two modes: dry rubbing, which simulates friction under normal wearing conditions, and wet rubbing, which represents more severe conditions involving moisture such as perspiration or rain. In both modes, a white cotton rubbing cloth is attached to a rubbing finger and rubbed against the test specimen under a defined force and stroke length. The degree of color transferred onto the white cloth is then evaluated against a grey scale for staining.

The principal standards governing this test include:

• ISO 105-X12 / EN ISO 105-X12 — Textiles: Tests for colour fastness — Colour fastness to rubbing
• AATCC 8 — Colorfastness to Crocking: Crockmeter Method
• AATCC 165 — Colorfastness to Crocking: Rotary Vertical Crockmeter Method
• GB/T 3920 — Chinese national standard, technically aligned with ISO 105-X12
• JIS L 0849 — Japanese testing methods for colour fastness to rubbing

Results are expressed on a grey scale for staining ranging from grade 1 (severe staining) to grade 5 (no visible staining), with intermediate half-step ratings such as 3-4 permitted. Most commercial protocols and national safety codes, such as GB 18401 in China, specify minimum rubbing fastness grades that products must achieve before market release.

Testing Samples

Woven and Knitted Fabrics

Dyed and printed woven and knitted fabrics constitute the largest category of test samples. Specimens are cut with the length direction of the fabric aligned with the rubbing direction, and both warp and weft faces should be considered where the fabric construction differs. Yarn-dyed, piece-dyed, union-dyed, and printed constructions are all suitable for standard crockmeter testing.

Printed and Pigment-Coated Textiles

Printed fabrics, particularly those using pigment binders, discharge, or discharge-resist techniques, are routinely tested because surface deposits of pigment or unfixed dye can transfer readily. Pigment-printed textiles often exhibit lower wet rubbing fastness, making this test a critical quality gate before shipment.

Yarns, Threads, and Narrow Fabrics

Coated, Laminated, Flocked, and Napped Materials

Coated and laminated fabrics, flock surfaces, suede-like materials, and raised or brushed fabrics may be tested with alternative finger geometry, such as a larger-diameter or rectangular finger, to ensure representative contact with the pile or surface layer. For deep-pile fabrics, test parameters may be adjusted in accordance with the product specification or the relevant standard.

Carpets and Automotive Textiles

Floor coverings, automotive seat fabrics, and interior trim textiles are frequently evaluated for color transfer because they experience sustained abrasion in service. Rotary vertical crockmeter methods, such as AATCC 165, are commonly applied to finished articles or large samples that cannot easily be cut into standard specimens.

Testing Items

The core testing items for rubbing color fastness include:

• Dry rubbing color fastness — the degree of staining transferred by rubbing with a dry standard cotton cloth under controlled force and stroke.
• Wet rubbing color fastness — the degree of staining transferred by rubbing with a cotton cloth wetted with water to a specified moisture content.
• Grey scale staining assessment — visual or instrumental evaluation of the stained rubbing cloth against the grey scale for staining (ISO 105-A03), reported as grades 1 to 5.
• Instrumental color transfer assessment — optional colorimetric measurement of the stained cloth to provide objective chromatic data supporting the visual grade.

Typical commercial acceptance criteria require a minimum of grade 4 for dry rubbing and grade 3 for wet rubbing on most fashion and home textile products. Deep shades such as indigo denim, reactive black, and sulfur-dyed fabrics are frequently granted a relaxed tolerance of grade 2-3 or 3 for wet rubbing under buyer agreements or national regulations.

Testing Methods

Apparatus and Materials

The test is conducted on a crockmeter, which consists of a cylindrical rubbing finger of 16 mm diameter mounted so that it exerts a downward force of 9 N on the specimen, moving in a reciprocating straight line over a stroke of 104 mm at a controlled speed. Accessories include undyed, bleached cotton rubbing cloth free of optical brightening agents, cut into squares of 50 mm (or 51 mm per AATCC practice), deionized water for wetting, a grey scale for staining, and conditioning facilities maintaining the standard atmosphere of 20 ± 2 °C and 65 ± 4% relative humidity in accordance with ISO 139.

Specimen Preparation and Conditioning

At least two specimens are prepared: one for the dry test and one for the wet test, with replicate determinations recommended for statistical reliability. Specimens measuring approximately 50 mm × 140 mm are cut with the long axis parallel to the warp or wale direction, unless otherwise specified. All specimens and rubbing cloths are conditioned in the standard atmosphere before testing to ensure reproducible moisture content. Fabrics that have undergone aftertreatments such as softening or resin finishing are tested in their final commercial state.

Dry Rubbing Procedure

• Secure the conditioned specimen flat on the crockmeter base, either free from creases or held by a clamping device, ensuring the test surface faces upward.
• Mount the dry standard cotton rubbing cloth onto the rubbing finger with the warp direction of the cloth running in the direction of movement.
• Set the rubbing finger onto the specimen with a downward force of 9 N and operate the machine for 10 complete to-and-fro cycles over the 104 mm stroke within approximately 10 seconds.
• Remove the rubbing cloth and condition it in the standard atmosphere before evaluation.

Wet Rubbing Procedure

• Soak a fresh cotton rubbing cloth in freshly prepared deionized water and adjust the moisture content to the specified wet pick-up, approximately 95-100% according to ISO 105-X12 or 65 ± 5% according to AATCC 8, verified gravimetrically.
• Mount the wet cloth on the rubbing finger without delay to prevent evaporation losses.
• Rub the conditioned specimen for 10 complete cycles under the same force and stroke conditions as the dry test.
• Remove the wet cloth, allow it to dry naturally in air at room temperature without applying heat above 60 °C, and condition it before grading.

Evaluation and Grading

The stained face of each rubbing cloth is compared with the grey scale for staining under a standard light source, typically D65 illumination, by trained assessors viewing the samples at a defined angle. The staining grade is assigned from 1 to 5, with half-step ratings permitted. For improved objectivity, instrumental assessment of the color transferred to the rubbing cloth may be performed using colorimetric procedures in accordance with AATCC Evaluation Procedure 7 or the instrumental annex of the relevant standard. When replicate determinations are made, the reported result is typically the lower or consensus grade.

Report Content

A complete test report should include the following elements:

• Identification and description of the sample, including fabric construction and coloration method
• The testing standard and method used, including any deviations or alternative finger geometry
• Number of specimens and replicate determinations
• Dry and wet rubbing staining grades, reported to the nearest half step
• Whether grading was performed visually, instrumentally, or both
• Conditioning atmosphere and any pretreatment applied to the specimen

Applications

Rubbing color fastness testing is applied throughout the textile supply chain, from dye houses and fabric mills to garment manufacturers, brands, retailers, and accredited third-party laboratories. Its principal applications include:

• Quality control of dyed and printed fabrics before cutting and sewing, preventing color transfer defects in finished garments
• Compliance verification against national safety regulations such as GB 18401 and mandatory product labeling requirements
• Buyer and retailer conformance programs for fashion apparel, uniforms, lingerie, and children's clothing, where skin contact and staining risk are heightened
• Home textile certification for bedding, towels, curtains, upholstery, and decorative fabrics subject to repeated abrasion
• Automotive interior textile qualification, where seat and trim fabrics must resist color transfer under prolonged use and humidity
• Denim garment development, evaluating the effects of washing, stone-washing, enzyme treatment, and resin finishing on wet crocking performance
• Research and development by dye, auxiliary, and binder producers to optimize fixation systems and aftertreatment chemistries

By identifying products with inadequate dye fixation or excessive surface dye at an early stage, the test helps manufacturers reduce claims, rework, and reputational damage while supporting consistent product safety across global markets.

FAQ

What is the difference between the dry and wet rubbing tests?

In the dry test, a dry cotton cloth is rubbed against the specimen to simulate normal wear friction, while in the wet test the cloth is moistened with water to a defined pick-up level. The wet test is more severe because water swells fibers and partially solubilizes unfixed dyes, so wet rubbing grades are almost always lower than dry rubbing grades for the same sample.

What rubbing fastness grade is considered acceptable?

For most apparel and home textiles, buyers require a minimum of grade 4 dry and grade 3 wet. National regulations and buyer specifications may allow grade 2-3 for wet rubbing on deep shades such as indigo denim and sulfur black, but this relaxation is always product- and contract-specific and must be confirmed in advance.

Why is wet rubbing fastness often lower than dry rubbing fastness?

Water promotes fiber swelling, reduces intermolecular forces binding the dye, and can dissolve or mobilize hydrolyzed or unfixed dye remaining on the fiber surface. Dye classes with poor fixation efficiency, inadequate soaping-off, heavy depths of shade, and certain silicone softeners further aggravate wet color transfer.

Which standard should I use: ISO 105-X12, AATCC 8, or GB/T 3920?

GB/T 3920 is technically aligned with ISO 105-X12, so both produce equivalent procedures using approximately 100% wet pick-up for the wet test. AATCC 8 follows the same crockmeter principle but specifies a 65% wet pick-up and slightly different cloth dimensions, which can yield marginally different wet results. The choice depends on the destination market and the buyer's contractual requirements.

Can yarns and finished garments be tested?

Yes. Yarns are wound onto a suitable flat former to create an even test surface, and finished garments or large articles can be tested directly, particularly with a rotary vertical crockmeter, which permits testing on any part of a completed product without cutting specimens.

How can rubbing color fastness be improved?

Effective measures include selecting dyes with high fixation rates appropriate to the fiber, optimizing dyeing and fixation parameters, performing thorough soaping and washing-off to remove unfixed dye, applying suitable cationic fixing agents, controlling depth of shade, and evaluating softener and finish formulations that may increase surface dye migration.