GB/T 21551.5-2024 PDF English (GB 21551.5-2010: Older version)

GB/T21551.5-2024 (GBT21551.5-2024): PDF in English

GB/T 21551.5-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 97.060 CCS Y 62 Replacing GB 21551.5-2010 Antimicrobial and Cleaning Function of Household and Similar Electrical Appliances - Part 5.Particular Requirements for Electric Washing Machine ISSUED ON. DECEMBER 31, 2024 IMPLEMENTED ON. JANUARY 1, 2027 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword... 3 Introduction... 5 1 Scope... 7 2 Normative References... 7 3 Terms and Definitions... 8 4 Technical Requirements... 8 5 Test Methods... 10 6 Marking and Instructions for Use... 12 Appendix A (normative) Test Method for Microbial Reduction... 14 Appendix B (informative) Test Method for Microbial Reduction (reference appliance as control)... 21 Appendix C (normative) Test Method for Virus Reduction... 23 Bibliography... 28 Antimicrobial and Cleaning Function of Household and Similar Electrical Appliances - Part 5.Particular Requirements for Electric Washing Machine 1 Scope This document defines the terms and definitions of household and similar electric washing machines with the antimicrobial, microbial reduction and cleaning functions, specifies the hygiene and safety, and functional requirements, as well as the marking requirements, and describes the corresponding test methods. This document applies to the production, inspection and sales of household and similar washing machines (hereinafter referred to as “washing machines”) that are explicitly stated to have one or more functions of antimicrobia, preventing mildew, microbial reduction, dust mite reduction, allergen reduction, virus reduction and deodorization on the appliance or instructions for use. This document does not apply to. ---Production, inspection and sales of ordinary semi-automatic washing machines; ---Inspection of the drying function of washing and drying machines. 2 Normative References The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. 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 4288-2018 Household and Similar Electrical Washing Machine GB 4789.2 National Food Safety Standard - Microbiological Examination of Food. Aerobic Plate Count GB 4789.15 National Food Safety Standard - Food Microbiological Examination. Enumeration of Molds and Yeasts GB/T 5296.2 Instructions for Use of Products of Consumer Interest - Part 2.Household and Similar Electrical Appliances GB 5749 Standards for Drinking Water Quality GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of The final test result of harmful substances of washing machines shall be the test value minus the background concentration value in the laboratory environment. The measurement of ozone leakage and UV leakage is generally carried out in a closed test environment, and the background concentration of the test environment shall comply with the requirements of GB/T 18883-2022.In addition, the test shall start after the washing machine starts running. During the test, add the load in accordance with the requirements of Appendix A, and no bacteria- contaminated test sample blocks are added. If the washing machine has multiple operating states, the most unfavorable state shall be selected for testing. 5.2.2 Ozone leakage At 5 cm away from the crack of the washing machine door / cover (center position of the edge and the geometric center position), set up a total of 4 sampling points on the left, right, top and front. For wall-mounted washing machines, a sampling point shall be added at the bottom. In accordance with the ultraviolet photometry method in Appendix A of GB/T 18883-2022, measure the ozone concentration, and take the maximum value as the test value. 5.2.3 UV leakage Place the washing machine in a dark room (set up a black radiation barrier to minimize reflection and stray light). At 30 cm away from the crack of the washing machine door / cover (center position of the edge and the geometric center position) and other possible UV leakage points, set up a total of 4 sampling points on the left, right, top and front. For wall-mounted washing machines, a sampling point shall be added at the bottom. Use a UV radiation meter to measure the UV intensity. Measure the UV with a main wavelength of 253.7 nm and take the maximum value as the test value. If the manufacturer explicitly states that the main wavelength of ultraviolet light is another value, then, additional tests shall be carried out for that wavelength. 5.2.4 Silver content After each washing and rinsing process of the washing machine, take samples from the drainage process of the test prototype (discard the first L), and in accordance with the relevant method of GB 5749, determine the silver content. Take the maximum value as the test value. NOTE. do not take samples during the dehydration process of the test prototype. 5.3 Test Methods for Antimicrobia, Microbial Reduction and Cleaning 5.3.1 Test methods for materials and components and parts For materials with the antimicrobial and preventing mildew functions used for washing machines, or components and parts containing materials with the above-mentioned functions, the antimicrobial rate and preventing mildew level shall be tested in accordance with the methods specified in GB/T 21551.2. 5.3.2 Test methods for the whole machine 5.3.2.1 Test method for the microbial reduction function When using the washing machine’s own program as the control group, in accordance with the method specified in Appendix A, carry out the test. When a drum-type reference washing machine is used as the control group, the test method is shown in Appendix B. 5.3.2.2 Test method for the dust mite reduction function In accordance with the method specified in QB/T 5958-2023, carry out the test. 5.3.2.3 Test method for the allergen reduction function In accordance with the method specified in QB/T 5958-2023, carry out the test. 5.3.2.4 Test method for the virus reduction function In accordance with the method specified in Appendix C, carry out the test. 5.3.2.5 Test method for deodorization In accordance with the method specified in QB/T 5958-2023, carry out the test. 6 Marking and Instructions for Use 6.1 Marking Principles The marking and instructions for use of washing machine products that are explicitly stated to have the antimicrobial, preventing mildew, microbial reduction, dust mite reduction, allergen reduction, virus reduction and deodorization functions shall comply with the requirements of relevant national laws, regulations and mandatory standards. 6.2 Basic Requirements for Marking For washing machine products that are explicitly stated to have the antimicrobial, preventing mildew, microbial reduction, dust mite reduction, allergen reduction, virus reduction and deodorization functions, their instructions for use shall comply with the relevant requirements of GB/T 5296.2. 6.3 Marking Content For washing machine products that are explicitly stated to have one or more of the antimicrobial, preventing mildew, microbial reduction, dust mite reduction, allergen reduction, virus reduction and deodorization functions, when they comply with the requirements of 4.2.1, and 4.2.2.1 ~ 4.2.2.5, and the functions are marked, the following contents shall be included in the textual description of one of the three. the appliance body, the packaging box or the instructions for use. Appendix A (normative) Test Method for Microbial Reduction A.1 Test Bacterial Species and Instruments A.1.1 Test bacterial species A.1.1.1 Categories of test bacterial species Bacterial species. ---Escherichia coli (CGMCC 1.90, CICC 10389); ---Staphylococcus aureus subsp. aureus (CGMCC 1.89, which is equivalent to ATCC 6538P, CICC 10307). Fungal species. Candida albicans (CGMCC 2.2086, which is equivalent to ATCC 10231, CICC 1943). If necessary, other bacterial species may also be added and other fungal species may be selected as test bacterial species. All bacterial species or strains shall be provided by corresponding national bacterial species preservation and management institutions, and the names of the test bacterial species and strain numbers shall be clearly stated in the report. Laboratories shall use test microorganisms in accordance with relevant national safety regulations. If other test pathogens are selected, the laboratories shall have a biosafety protection level that is compatible with the hazards and shall not involve the first and second categories of pathogenic microorganisms in the Catalogue of Pathogenic Microorganisms Transmissible to Humans. The various culture medium components used to culture bacterial species shall comply with the requirements of the bacterial species preservation and management institutions. A.1.1.2 Culture conditions Except for special requirements for the culture of test bacterial species, the general culture conditions of bacteria in the test bacterial species shall comply with the relevant requirements of GB/T 21551.2.The culture medium for Candida albicans shall be Sabouraud’s agar, the culture temperature shall be (28  1) C, and the culture time shall be (48  1) h. The culture conditions in this document are based on Escherichia coli, Staphylococcus aureus subsp. aureus and Candida albicans as examples. If other test bacterial species are selected, Use an inoculation loop to scrape an appropriate amount of fresh fungal culture from the fresh culture, add it to 0.85% (mass fraction) sterile physiological saline, dilute the bacterial solution to a.......
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