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GB/T 8427-2019: Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 8427: Historical versions
GB/T 8427-2019: Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8427-2019 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.01 W 04 Replacing GB/T 8427-2008 Textiles - Tests for color fastness - Color fastness to artificial light. Xenon arc (ISO 105-B02.2014, Textiles - Tests for color fastness - Part B02.Color fastness to artificial light. Xenon arc fading lamp test, MOD) Issued on. DECEMBER 31, 2019 Implemented on. JULY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 8 4 Principle... 9 5 Reference materials and apparatus... 10 5.1 Reference materials... 10 5.2 Apparatus... 11 6 Preparation of test specimens... 13 7 Exposure conditions... 14 8 Procedure... 15 8.1 Apparatus set-up... 15 8.2 Adjustment of the effective humidity (see Clause 7 and Annex E)... 15 8.3 Exposure methods... 17 9 Assessment of color fastness to light... 26 10 Test report... 28 Annex A (Informative) General information on color fastness to light... 31 Annex B (Informative) Light exposure equivalents for blue wool references L2 to L9... 34 Annex C (Normative) Requirements for xenon arc lamp exposure devices... 35 Annex D (Normative) Procedures for measuring the irradiance uniformity in the specimen exposure area (for apparatus manufacturers only)... 39 Annex E (Informative) Guidelines for conducting testing... 42 Bibliography... 54ForewordThis Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 8427-2008 "Textiles - Tests for color fastness - Color fastness to artificial light. Xenon arc fading lamp test". Compared with GB/T 8427-2008, the main changes of this Standard are as follows. - Adjust the note in Clause 1 of the previous standard to the note in Clause 3 of this Standard; - Delete the normative reference GB/T 8426; replace FZ/T 01024 with GB/T 32616; ADD references to GB/T 730, ISO 105-B01.2014 and ISO 9370; - Delete "For white (bleached or optically brightened) textiles, the whiteness change of the test specimen is compared with the blue wool reference material to evaluate the color fastness" (see Clause 3 of the 2008 edition); - ADD a clause of "Principle" (see Clause 4); - ADD "The blue wool references 1 to 8 used in this test shall meet the quality requirements specified in GB/T 730." (see 5.1.2); - Delete the content of humidity-test control fabric (see 4.1.3 of the 2008 edition); - Adjust "the content of the apparatus, does not distinguish in detail between air-cooled and water-cooled" (see 5.2; 4.2 of the 2008 edition); - ADD "tolerance of irradiance" (see 5.2.1.5); - Delete 5.3 (see 5.3 of the 2008 edition); - Adjust the exposure conditions (see Clause 7); - Refine the effective humidity adjustment steps (see 8.2); - ADD preliminary assessment of test specimens (see 8.3.2.4); - ADD a way to replace the original cover with an enlarged cover (see 8.3.2.7, 8.3.3.5, 8.3.3.6, 8.3.4.4 and 8.3.5.4); - Modify the L9 corresponding to the light fastness 8 TO L8 (see 8.3.2.9; 7.2.2.4 of the 2008 edition); - Modify the L4 corresponding to the light fastness 6 TO L5 (see 8.3.3.6; 7.2.3.4 of the 2008 edition); - Refine the test procedures of Method 3; INCREASE from 2 contrast blue wool references to 3 blue wool references (see 8.3.4; 7.2.4 of the 2008 edition); - Modify the rating stage in Method 4; CHANGE from "grey scale grade 4 and/or 3" to "grey scale grade 4 and 3" (see 8.3.5; 7.2.5 of the 2008 edition); - Modify "based on the contrasts equal to grey scale grade 4 and grey scale grade 3 (5.2.9)" (see 9.1; 8.1 of the 2008 edition); - Modify "a rating of ‘less than 1’ (or ‘less than L2’)" (see 9.3; 8.3 of the 2008 edition); - ADD reporting of assessment result of each period [see Clause 10 c) and d)]; - Delete the contents of Annexes A, B and C of the previous standard and integrate and update to Annex C of this Standard; - Adjust Annex D of the previous standard to Annex A of this Standard; - Adjust Annex E of the previous standard to Annex B of this Standard; - ADD Annex D; - ADD Annex E. This Standard uses the redraft law to modify and adopt ISO 105-B02.2014 "Textiles - Tests for color fastness - Part B02.Color fastness to artificial light. Xenon arc fading lamp test". Compared with ISO 105-B02.2014, the structural changes of this Standard are as follows. - EXCHANGE the positions of Clause "Principle" and Clause "Terms and definitions"; - Delete the subclause number under 5.2.1.4, to avoid further sub-articles under the untitled article; - Delete the subclause number under 5.2.1.5, to avoid hanging paragraphs and further sub-articles under the untitled article; - Adjust "Annex D" to this Standard "Annex A", "Annex C" to this Standard "Annex B", "Annex A" to "Annex C", and "Annex B" to "Annex D". The technical differences between this Standard and ISO 105-B02.2014 and their reasons are as follows. - As for the normative references, this Standard has adjusted with technical differences, to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 “Normative references”. The specific adjustments are as follows. Replace ISO 105-A02 with GB/T 250 which is identical to the international standard; Replace ISO 105-B08 with GB/T 730 which modifies and adopts the international standard; Replace ISO 105-A01 with GB/T 6151 which modifies and adopts the international standard; Replace ISO 3696 with GB/T 6682 which modifies and adopts the international standard; Replace ISO 105-B05 with GB/T 8431 which is equivalent to the international standard; Replace ISO 105-A05 with GB/T 32616 which modifies and adopts the international standard; ADD reference to FZ/T 01047; Delete the reference to CIE 51; - ADD footnote d to Table 2; - Amend "If the necessary contrast in 8.2.5 is not achieved" in 8.2.7 to "If the necessary contrast in 8.2.6 is not achieved"; - In Clause 10 c) and d), where the difference between the individual assessments of the periods exceeds one half grade, change the remark "grey scale grade of blue reference" to the remark "specific period"; and, add the reporting of the mean assessment result of color fastness to light; - In Clause 10 d), delete the reporting of reference sample; in e), delete the reporting of blue wool reference; - ADD the descriptions for Figure D.1 and Figure D.2. This Standard has made the following editorial change. - CHANGE the standard name to "Textiles - Tests for color fastness - Color fastness to artificial light. Xenon arc". Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights. This Standard was proposed by China National Textile & Apparel Council. This Standard shall be under the jurisdiction of Technical Committee 209 on Textiles of Standardization Administration of China (SAC/TC 209). Drafting organizations of this Standard. Chinatesta Textile Testing & Certification Services, Q-Lab Corporation Shanghai Representative Office, Anhui Yuhua Textile Co., Ltd., Wenzhou Darong Textile Instrument Co., Ltd., Wenzhou Fangyuan Instrument Co., Ltd., Luthai Textile Co., Ltd., Ningbo Textile Instrument Factory, SDL Atlas (Shenzhen) Co., Ltd., Jinjiang Chinatesta Testing Services Co., Ltd., Atlas Material Testing Technology Co., Ltd., Changle Lita Knitting Co., Ltd., Shanghai Textile Group Testing Standard Co., Ltd. Main drafters of this Standard. Han Yuru, Li Zhien, Yang Xiaoxiao, Zhang Heng, Zhang Mengsheng, Cheng Jian, Hu Junwei, Zhang Jianxiang, Jian Zhiguang, Zhang Zhi, Cao Lingling, Chen Xiaocheng, Chen Siwei, Geng Caihua, Lin Bihua. The previous editions of the standard replaced by this Standard were released as follows. - GB/T 8427-1987, GB/T 8427-1998, GB/T 8427-2008. Textiles - Tests for color fastness - Color fastness to artificial light. Xenon arc1 ScopeThis Standard specifies a method intended for determining the effect on the color fastness of textiles of all kinds and in all forms to the action of an artificial light source representative of natural daylight (D65).2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing change in colour (GB/T 250-2008, ISO 105-A02.1993, IDT) GB/T 730 Textiles - Tests for colour fastness - Quality control of Blue wool reference materials 1 to 7 (GB/T 730-2008, ISO 105-B08.1995, MOD)3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. Ratio of the actual water vapour pressure in the test chamber to the saturation water vapour pressure of water at the same temperature. A red azoic dyed cotton fabric of known sensitivity to humidity and light.4 PrincipleA specimen of the textile to be tested is exposed to artificial light under controlled conditions, together with a set of blue wool reference materials. The color fastness is assessed by comparing the change in color of the test specimen with that of the reference materials used.5 Reference materials and apparatusOne of two types shall be used, either a black-standard thermometer or a black- panel thermometer (for more detail see C.3.) and the thermometer shall be mounted in the same plane and orientation as the test specimen(s). Covers shall be made from thin opaque material, for example high-grade steel, thin sheet aluminium or cardboard covered with aluminium foil, for partial covering of samples and blue wool references.6 Preparation of test specimens6.6 When testing specimens of appreciable thickness, the references shall be arranged (for example, insert a hard card under the blue wool reference), so that they are the same distance from the light source as the upper surface of the test specimens. Covers for the unexposed portions shall avoid surface compression. Textiles of appreciable thickness with textured structure which may make evaluation of small areas difficult, shall be tested with an exposed area not less than 50 mm × 40 mm and preferably larger.7 Exposure conditionsTo simulate different environments testing can be carried out under different conditions (see Table 2). The type of conditions should be agreed between parties. The chosen conditions shall be reported.8 Procedure8.3.4.3 Place the masked card in the test chamber and expose the masked card to light under the selected exposure conditions in Table 2 until the contrast between the unexposed and exposed portions of the target blue wool reference is equal to a grey scale grade 4 (5.2.9) (first period). 8.3.4.5 Replace the masked card in the test chamber and continue to expose until the contrast between the exposed and unexposed portions of the target blue wool reference is equal to grey scale grade 3 (5.2.9) (second period).9 Assessment of color fastness to lightComparison of the changes in the test specimen with changes in the blue wool references shall be facilitated by surrounding the specimen with an assessment mask (5.2.8). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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