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GB/T 13174-2021: Determination of detergency and cycle of washing property for laundry detergents 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 13174: Historical versions
Similar standardsGB/T 13174-2021: Determination of detergency and cycle of washing property for laundry detergents---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/GBT13174-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.40 Y 43 Replacing GB/T 13174-2008 Determination of Detergency and Cycle of Washing Property for Laundry Detergents [Including No.1 Amendment List 2023XG1] Issued on. MARCH 9, 2021 Implemented on. OCTOBER 1, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 Introduction... 4 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions, Symbols and Codes... 6 4 Test Principle... 8 5 Reagents and Materials... 9 6 Instruments and Equipment... 10 7 Test Procedures... 12 8 Result Calculation and Determination... 17 9 Test Report... 20 Appendix A (normative) Types and Production of JB Series Test Cloths... 22 Appendix B (normative) Requirements for the Types and Production of Reference Detergent... 27 Appendix C (normative) Technical Parameters of Rinsing Controller... 29 Appendix D (informative) Q Value Inspection Method... 30 Appendix E (normative) Inspection and Determination of Test Results of Rate of the Value of Detergency... 31 Bibliography... 33 No. 1 Amendment List [2023XG1]... 341 ScopeThis Standard specifies the methods of evaluating the detergency of detergents by performing detergency tests with artificial test cloths and evaluating the anti-soil-redeposition property of detergents by using white cotton cloths for control cycle washing. This Standard is applicable to the evaluation of detergency and anti-soil-redeposition property of laundry detergents.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 210.1-2004 Specification and Determination Methods of Sodium Carbonate for Industrial Use - Part 1.Sodium Carbonate for Industrial Use GB/T 4209-2008 Sodium Silicate for Industrial Use GB/T 6009-2014 Anhydrous Sodium Sulfate for Industrial Use GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods GB/T 25812 Standard Bleached Cotton Fabric Used for Dyeing Test HG/T 3268-2002 Triethanolamine for Industrial Use JJG 512 Whiteness Meters QB/T 1806-1993 Alkali Proteinase for Detergent QB/T 5481-2019 Detergent Builder - Sodium Polyacrylate Pharmacopoeia of the People’s Republic of China (Edition 2005)3 Terms and Definitions, Symbols and Codes3.1 Terms and Definitions The following terms and definitions are applicable to this document. 3.1.1 test cloths Test cloths refer to artificially soiled cloths made by treating the original white cotton cloths with the specified types of stains through a certain procedure, which are used to determine the ability of detergents to remove such stains. 3.1.2 pieces of test cloths Pieces of test cloths refer to soiled cloths cut into a circle or square of a certain size as required, and used for the detergency test. 3.1.3 whiteness index Whiteness index refers to the reflectance of the test cloths or pieces of test cloths to the light wave at the specified wavelength, which shall be read at 457 nm with a whiteness meter. 3.1.4 whiteness index before washing Whiteness index before washing refers to the whiteness index of the pieces of test cloths before washing with detergent. 3.1.5 whiteness index after washing Whiteness index after washing refers to the whiteness index of the pieces of test cloths after washing with detergent. 3.1.6 difference of the whiteness index Difference of the whiteness index refers to the difference between the whiteness index after washing and the whiteness index before washing.4 Test PrincipleIn the detergency test machine, in accordance with the specified temperature and washing time, use water with a certain hardness to prepare a detergent solution with a certain concentration; wash the various types of soiled test pieces, and use a whiteness meter to determine the whiteness index of the pieces of test cloths before and after washing at the selected wavelength. Take the whiteness difference of the pieces of test cloths to evaluate the detergency of the detergent.5 Reagents and MaterialsUnless it is otherwise specified, only reagents that are confirmed as analytically pure and Grade- 3 water that complies with GB/T 6682 are used in the analysis. 5.1 Calcium chloride (CaCl2). NOTE. calcium chloride with a certain hydration number may also be used, but it needs to be converted in accordance with the usage of CaCl2 specified in 7.1 during specific use. 5.4 Reference detergents. The formulation and preparation methods of the reference detergents are listed in Appendix B. The reference detergents are processed and produced with raw materials of uniform specifications and processes, and if necessary, uniformly customized. During use, in accordance with the requirements of this Standard or product standards, prepare them to the specified concentration. 5.5 Reference proteases Specifications of reference proteases. the reference proteases should be produced with raw materials of uniform specifications and processes, requiring uniform activity and a clarified shelf life. For the technical requirements of the product, see the superior product index in QB/T 1806-1993.In addition, carry out necessary identification of enzyme activity.6 Instruments and Equipment6.1 Vertical-type Detergency Test Machine 6.2 Whiteness Meter Fluorescent whiteness meter. The illumination and detection modes are vertical illumination diffuse detection (o/d). It conforms to the verification requirements of JJG 512. 6.8 Rinsing Controller (optional) See the technical parameters in Appendix C.7 Test Procedures7.1 Preparation of Hard Water In the washing test, the detergent solution is prepared using 250 mg/kg (calculated as CaCO3, the same below) hard water, and the molar ratio of Ca2+ and Mg2+ is 6.4.The preparation method is as follows. weigh-take 16.70 g of calcium chloride (5.1) and 20.37 g of magnesium chloride (5.2), prepare 10.0 L, which is 2,500 mg/kg hard water. When in use, take 1.0 L and dilute to 10.0 L, which is 250 mg/kg hard water. 7.2 Detergency Determination 7.2.1 Preparation of pieces of test cloths In accordance with the requirements of the detergent performance test, select the required variety of JB series test cloth pieces. Cut the soiled cloths (5.3) used for determination into pieces of test cloths. In accordance with the category, respectively match them into six groups with similar average chromaticity (in order to eliminate the differences among different batches of soiled cloths, the six groups of test cloth pieces shall be cut from the same piece of JB series soiled cloth as much as possible). In each group, there shall be 4 or more JB test cloth pieces for the detergency test, and 6 JB-00 test cloth pieces for the whiteness preserved or cycle of washing property test. Meanwhile, record the numbers of the test cloth pieces, and each group of test cloth pieces is used for the performance test of one sample. 7.2.2 Measurement of whiteness During the detergency or cycle of washing property test, stack the pieces of test cloths in accordance with the same category, and use the whiteness meter to read the whiteness index before and after washing one by one at 457 nm. 7.3 Detergency and Washing Tests The detergency and washing tests are carried out in accordance with the following steps.8 Result Calculation and Determination8.1 Calculation and Determination of Test Results of Detergency 8.1.1 Calculation of value of detergency of test cloths The value of detergency (Ri) of a certain type of test cloths is calculated in accordance with Formula (1). 8.1.2 Calculation of rate of the value of detergency in comparison with reference detergent The rate of the value of detergency of the ith type of test cloth (Pi) in comparison with the reference detergent is calculated in accordance with Formula (2). 8.2 Evaluation of Cycle of Washing Property 8.2.1 Calculation and determination of test results of whiteness preserved In accordance with the test results of 7.4.1, in accordance with Formula (3), calculate the value of whiteness preserved (Tk). 8.2.2 Calculation of test results of ash deposition In accordance with the test results of 7.4.2 and Formula (5), calculate the ash deposition (Sk). 8.2.3 Evaluation of appearance (roughness) and softness The evaluation of the appearance (rough / smooth) and softness of the fabric after washing can be conducted through artificial sensory evaluation or instrumental method. Artificial sensory evaluation is carried out by more than five experienced judges. For the two test cloth pieces reserved in 7.4.2, carry out visual inspection and hand-touch comparison to judge whether the appearance (rough / smooth) and softness of the test cloth pieces after being subjected to the washing cycles by the sample detergent are superior or inferior to the test cloth pieces subjected to the same number of washings by the reference detergent. 8.2.4 Determination of cycle of washing property From the comparison of the rate of the value of whiteness preserved between the sample and the reference detergent after washing cycles, the rate of ash deposition and sensory evaluation, comprehensively judge whether the performance of the sample detergent is superior, equivalent or inferior to that of the reference detergent.9 Test ReportThe test report shall include the following items. a) The reference method used; b) The results and the method of presentation used; c) Test conditions; d) Any operation not included in this Standard or any optional operation, as well as situations that may affect the results. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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