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GB 21551.2-2010 PDF in English


GB 21551.2-2010 (GB21551.2-2010) PDF English
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GB 21551.2-2010: PDF in English

GB 21551.2-2010
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 97.030
Y 60
Anti-bacterial and cleaning function for household and similar
electrical appliances – Particular requirements of material
ISSUED ON. JANUARY 14, 2011
IMPLEMENTED ON. SEPTEMBER 15, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Assessment requirements ... 4 
5 Technical requirements ... 5 
Appendix A (Normative) Anti-bacterial performance test method 1 (film method)
and effect assessment ... 6 
Appendix B (Normative) Anti-bacterial performance test method 2 (absorption
method) and effect assessment ... 11 
Appendix C (Normative) Anti-bacterial performance test method 3 and effect
assessment ... 15 
Appendix D (Informative) Household and similar electrical products
anti-bacterial component catalog ... 21 
Foreword
All technical contents of this part are mandatory.
GB 21551 “Anti-bacterial and cleaning function for household and similar
electrical appliances” series standard is composed of several parts, wherein
the 1 part is general requirement AND the other parts are particular
requirements.
This part is part 2 of GB 21551. This part shall be used in conjunction with GB
21551.1-2008 “General requirement for anti-bacterial and cleaning function for
household and similar electrical appliances”.
Appendix A, Appendix B, Appendix C of this part are normative, AND Appendix
D is an informative appendix.
This part was proposed by the China Light Industry Federation.
This part shall be under the jurisdiction of the National Household Electrical
Appliances Standardization Technical Committee (SAC/TC 46).
The drafting organizations of this part. China Household Electrical Appliances
Research Institute, China Association of Anti-bacteria Materials and Products
Industry, China Disease Control and Prevention Center Environmental and
Health-related Products Safety Institute, Haier Group, Guangdong Media
Group, Beijing Yadu Technology Co., Ltd.
The main drafters of this part. Zhang Tieyan, Wang Junqi, Ji Junhui, Li Yi,
Chen Hui, Zheng Chongkai, Gao Baohua.
This part is the first release.
Anti-bacterial and cleaning function for household and similar
electrical appliances – Particular requirements of material
1 Scope
This part of GB 21551 specifies the performance test methods and effect
assessment of the anti-bacterial material, component anti-bacteria and
anti-mildew (hereinafter referred to as “anti-bacterial”) of the household and
similar electrical appliances.
This part is applicable to the anti-bacterial performance test method and effect
assessment of the anti-bacterial material and relevant anti-bacterial
components which are used in the household appliances.
2 Normative references
The provisions in following documents become the provisions of this part
through reference in this part of GB 21551. For the dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard; however, parties who reach an agreement based on this
Standard are encouraged to study if the latest versions of these documents are
applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 4789.2 National food safety standards – Microbiological examination -
Determination of total number of colonies
GB 19489 Laboratories – General requirements for biosafety
“Technical specifications for disinfection” (Ministry of Health, 2002 version)
3 Terms and definitions
The terms and definitions established in GB 21551.1-2008 apply to this part of
GB 21551.
4 Assessment requirements
Anti-bacterial material. anti-bacterial rate is greater than or equal to 90%, AND
meanwhile it complies with the requirements of Appendix A.2.3 in GB
21551.1-2008;
Anti-mildew material. anti-mildew grade is 1 or 0;
Anti-bacterial/mildew material. anti-bacterial rate is greater than or equal to
90%, AND meanwhile the anti-mildew grade is 1 or 0.
Appendix A
(Normative)
Anti-bacterial performance test method 1 (film method) and effect
assessment
A.1 Test sample requirements
A.1.1 Test sample
The test sample made from the anti-bacterial components or same materials
through same technologies, in the size of (50 ± 2) mm × (50 ± 2) mm, OR the
test area of not less than 1600 mm2.
A.1.2 Control sample
Standard sample of hygienic high density polyethylene (HDPE) injection
molding, in the size of (50 ± 2) mm × (50 ± 2) mm AND the thickness of not
more than 5 mm.
A.1.3 Cover film for test
Polyethylene film, in the thickness of 0.05 mm ~ 0.10 mm AND in the size of
(40 ± 2) mm × (40 ± 2) mm.
A.2 Test principle
In this method, the bacteria are inoculated quantitively onto the test sample
and the control sample, AND the film method is used to make the bacteria
uniformly contact with the sample; after culturing for (24 ± 1) h, the number of
viable bacteria in the two groups of samples are measured, AND the
anti-bacterial rate of the sample is compared and calculated.
A.3 Test environment
The test adopts aseptic technique, AND the laboratory environment shall
comply with GB 19489.
A.4 Strains, materials, instruments and equipment
A.4.1 Test bacteria
a) Staphylococcus aureus AS 1.89, equivalent to ATCC 6538 p;
b) Escherichia coli AS 1.90.
Note. In accordance with the requirements of the use of household appliances,
it may also select other strains as the test bacteria, BUT all the strains must be
A.5.7 Strain activation
TRANSFER the slope preservation bacteria to plate nutrient agar medium
(NB); CULTURE it at cultured at (37 ± 1) °C for (24 ± 1) h; TRANSFER it once
a day for no more than 2 weeks. During the test, it shall use the fresh bacterial
culture which is transferred within 24 h in the 3rd ~ 14th generation.
A.5.8 Preparation of suspension
USE the inoculation ring to scrape 1 ~ 2 rings of fresh bacteria from the A.5.7;
ADD it into the culture medium; MAKE 10 times gradient dilution in order;
SELECT the dilution having a bacterial solution concentration of 5.0 × 105
CFU/mL ~ 10.0 × 105 CFU/mL as the test bacterial solution; OPERATE in
accordance with the method as specified in GB/T 4789.2.
A.6 Test procedure
A.6.1 Product sterilization. before the test, IMMERSE the cover film, test
samples, and the control samples into 70% ethanol solution; after 1 min, USE
sterile water to flush it; LET it dry naturally. As for the sample which is not
applicable for disinfectant treatment, it may be flushed directly by the sterile
water. AND the other appliances used in the test may be sterilized in high
temperature hot and humid or dry heat method.
A.6.2 PLACE the test sample and the control sample in a sterilized plate;
A.6.3 Respectively TAKE 0.2 mL of the test suspension; DRIP it onto the test
sample and the control sample; MAKE 3 parallel tests for each group of
samples;
A.6.4 USE the sterile tweezers to take the sterile cover film to cover it onto the
test sample and the control sample, respectively; PAVE it flatly to make the
bacterial solution uniformly contact with the sample; COVER the plate;
CULTURE at (37 ± 1) °C and relative humidity of greater than 90% for (24 ± 1)
h;
A.6.5 TAKE out the sample which is cultured for (24 ± 1) h; respectively ADD
20 mL of eluent; WASH the test sample, control sample and cover film
repeatedly; after shaking it uniformly, DILUTE the eluent in gradient;
INOCULATE it into the nutrient agar medium (NA); CULTURE it at (37 ± 1) °C
for 24 h ~ 48 h; COUNT the viable bacteria; DETERMINE the number of viable
bacteria in the eluent in accordance with GB/T 4789.2.
A.7 Test data processing and effect assessment
A.7.1 Test results shall comply with the following requirements; otherwise the
test is invalid.
a) The viable bacteria number of the three parallel samples of the same set
of control samples shall comply with the following requirements.
Appendix B
(Normative)
Anti-bacterial performance test method 2 (absorption method) and effect
assessment
B.1 Test sample requirements
B.1.1 Test sample
It is directly cut from the test sample which had been subjected to anti-bacterial
treatment.
B.1.2 Control sample
A sample is cut directly from a 50 g/m2 plain polypropylene nonwoven fabric.
B.2 Test principle
In this method, the test sample and the control sample are inoculated with the
tested bacteria, the residual viable bacteria are eluted after culture, AND the
anti-bacter...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.