GB/T 3920-2024Textiles - Tests for colour fastness - Colour fastness to rubbing (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 3920-2008 Textiles - Tests for colour fastness - Colour fastness to rubbing. Compared with GB/T 3920-2008, except for structural adjustment and editorial changes, the main technical changes are as follows:

-- Add the tolerance of the rectangular rubbing head size [see 5.1a)];

-- Add the description of “with the long side parallel to the warp direction” (see oxide water-resistant fine sandpaper to “particle size of P600” (see 5.3; 4.3 of the 2008 edition);

-- Add “balance” in “equipment and materials” (see 5.5);

-- Add a chapter on “Reagents” and supplement the requirements for test water (see Chapter 6);

direction of the sample at 45° to the warp and weft directions of the fabric” (see 7.1; 5.1 of the 2008 edition);

-- Add the description of “With consultation among the relevant parties, conditioning may also be carried out in the optional standard atmosphere specified in GB/T 6529, which shall be stated in the test report. Place each sample and rubbing cloth on a sieve or perforated rack for conditioning.” (see 7.3);

-- Add the description of “Prepare two groups of samples, one for dry rubbing test and the other for wet rubbing test.” (see 8.1);

-- Change the description of the test steps for wet rubbing color fastness (see 8.3;

-- Change “water content” to “level of soak”, and add the calculation formula for level of soak (see 8.3; 6.3 of the 2008 edition);

rubbing cloth that may affect the rating.” to the assessment part (see 9.1; 6.2 of the 2008 edition);

-- Add descriptions of “test atmospheric conditions”, “If the sample is yarn and is woven into a fabric, indicate its organizational structure” and “any deviation from this document and any anomalies in the tests” in the test report (see Chapter 10).

This document adopts ISO 105-X12:2016 Textiles - Tests for colour fastness - Part X12: Colour fastness to rubbing by modification.

Compared with ISO 105-X12:2016, this document has the following structural adjustments:

-- Add “Terms and definitions” (see Chapter 3);

-- Add “Reagents” (see Chapter 6);

The technical differences between this document and ISO 105-X12:2016 and their reasons are as follows:

-- Use the normatively referenced GB/T 251 to replace ISO 105-A03 (see 5.4), GB/T 6151-2016 to replace ISO 105-A01:2010 (see 9.3), GB/T 6529 to replace ISO 139 (see 7.3 and 7.4), GB/T 33729 to replace ISO 105-F09 (see 5.2), and add GB/T 6682 (see Chapter 6) to adapt to our country’s technical conditions;

-- Adjust the verification test to “Note” (see Chapter 5; Chapter 4 of ISO 105-

-- Adjust the “Note” about using other rubbing color fastness testers to 5.1 (see 5.1) to make the statement clearer;

-- Add the tolerance of the rectangular rubbing head size [see 5.1a)], to unify the test conditions;

-- Add the description of “with the long side parallel to the warp direction” (see 5.2), to unify the test operation;

-- Add “balance” in “Equipment and materials” (see 5.5) for the determination of level of soak in wet rubbing test;

-- Supplement the requirements for test water (see Chapter 6) to unify the test conditions;

-- Add the description “Prepare two groups of samples, one for dry rubbing test Chinastandards.org

-- Add content on the calculation and adjustment method of rubbing cloth level of soak (see 8.3) to make the statement clearer;

-- Add descriptions of “test atmospheric conditions”, “If the sample is yarn and is woven into a fabric, indicate its organizational structure” and “any deviation from this document and any anomalies in the tests” in the test report (see Chapter 10), to clarify the test conditions.

Textiles - Tests for colour fastness - Colour fastness to rubbing;

-- Add a description of “use the gray scale for staining” in the chapter “Principle” (see Chapter 4);

-- Add recommendations on the specifications of water-resistant fine sandpaper (see 5.3);

-- Remove the note on the use of other levels of soak (see 6.3 of ISO 105-

-- Add a note on “squeezing device” (see 8.3);

-- Refine the description of the wet rubbing color fastness test procedure (see

-- Add the note “During assessment, the degree of staining of the halo part is not taken into account.” (see Chapter 9).

Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying patents.

This document was proposed by China National Textile and Apparel Council.

This document shall be under the jurisdiction of National Technical Committee 209 on Textiles of Standardization Administration of China (SAC/TC 209).

Kunshan Great World Ink & Paint Co., Ltd., Best Textile Co., Ltd. Yichang, Hangzhou Daoxian Intelligent Technology Co., Ltd.

Main drafters of this document: Jing Fengdi, Si Ying, Yu Long, Tu Wenli, Li Su, Wang Qiang, Gu Hongyu, Huang Zheng, Yang Yubo, Zhou Xinxiang, Liu Qiqi, Chen Jinpeng, Sun Xia, Wang Ning, Tong Weihong, Zhao Kang, Xu Wencheng, Chen Xiaokang, Xu Jianguo, Fu Jiuli.

The previous versions of this document and the documents which are replaced by this document are as follows:

-- This is the third revision.

1 Scope

This document describes the test methods for colour fastness to rubbing of various types of textiles.

This document applies to dyed or printed yarns, fabrics and textile products made from all types of fibers, including textile carpets and other velvet fabrics.

This document includes two tests, one using a dry rubbing cloth and the other using a wet rubbing cloth.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 6682, Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696:1987, MOD)

3 Terms and definitions

No terms and definitions need to be defined in this document.

4 Principle

Rub the textile sample with a dry rubbing cloth and a wet rubbing cloth respectively, and use the gray scale for staining to assess the staining degree of the rubbing cloth. The testing machine for colour fastness to rubbing provides two combination test conditions through two optional sizes of rubbing heads: one for velvet fabrics; the other for other fabrics with solid colors or large-area printing.

5 Equipment and materials

5.1 Testing machine for colour fastness to rubbing, with a rubbing head of two optional sizes for reciprocating linear rubbing motion; other instruments that can obtain the same test results may also be used for this test. a) For velvet fabrics (including textile carpets): the rubbing surface of the rubbing head is rectangular and the size is (19.0±0.2) mm × (25.4±0.2) mm. The rubbing head shall apply a vertical downward pressure of (9±0.2) N, and the linear reciprocating stroke shall be (104±3) mm. mm, it may be difficult when assessing the degree of staining of the rubbing cloth. This is because the rubbing cloth will produce severe staining around the circular rubbing area, i.e., a halo. When testing velvet fabrics, the use of the rubbing head described in 5.1a) will eliminate the halo phenomenon. For fabrics with a long pile, it may be difficult to assess staining even with a rectangular rubbing head. 5.2 Cotton rubbing cloth, in accordance with the provisions of GB/T 33729, cut into squares with a side length of (50±2) mm for use in the rubbing head of 5.1b); cut into rectangles with a size of (25±2) mm × (100±2) mm for use in the rubbing head of 5.1a), with the long side parallel to the warp direction. 5.3 Water-resistant fine sandpaper, or metal mesh with stainless steel wire diameter of 1 mm and mesh width of about 20 mm. […]

6 Reagents

Grade-3 water, in line with the requirements of GB/T 6682.