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GB 2626-2019: [N95/KN95 face mask] Respiratory protection -- Non-powered air-purifying particle respirator
GB 2626-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.30
C 73
Replacing GB 2626-2006
Respiratory protection - Non-powered air-purifying
particle respirator
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Classification and marking ... 11 
4.1 Classification of facepiece ... 11 
4.2 Classification of filter element ... 11 
4.3 Grades of filter element ... 12 
4.4 Marking ... 12 
5 Technical requirements ... 12 
5.1 Basic requirements ... 12 
5.2 Visual inspection ... 13 
5.3 Filter efficiency ... 14 
5.4 Leakage ... 14 
5.5 Breathing resistance ... 15 
5.6 Exhalation valve ... 15 
5.7 Dead space ... 16 
5.8 View field ... 16 
5.9 Head harness ... 16 
5.10 Connections and connecting parts ... 17 
5.11 Lens ... 17 
5.12 Air tightness ... 17 
5.13 Flammability ... 17 
5.14 Cleaning and disinfection ... 18 
5.15 Practical performance ... 18 
5.16 Information to be provided by the manufacturer ... 18 
5.17 Packaging ... 20 
6 Testing methods ... 20 
6.1 Visual inspection ... 20 
6.2 Pretreatment ... 20 
6.3 Filter efficiency ... 22 
6.4 Leakage ... 26 
6.5 Inhalation resistance ... 31 
6.6 Exhalation resistance ... 34 
6.7 Air tightness of exhalation valve ... 34 
6.8 Protection device of exhalation valve ... 36 
6.9 Dead space ... 36 
6.10 View field ... 38 
6.11 Head harness ... 38 
6.12 Connections and connecting parts ... 39 
6.13 Lens ... 40 
6.14 Air tightness ... 40 
6.15 Flammability ... 41 
6.16 Practical performance ... 42 
7 Product marking ... 43 
7.1 Markings on the product ... 43 
7.2 Marking on the packaging ... 43 
Appendix A (Informative) Summary of testing requirements ... 45 
Appendix B (Informative) CMD and MMAD conversion method ... 48 
Appendix C (Normative) Method for judging whether KP filter element’s loading
filter efficiency continues to decrease ... 51 
Appendix D (Normative) Main dimensions of test head mold ... 53 
Appendix E (Informative) Main differences between this standard and the 2006
edition ... 54 
References ... 57 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 2626-2006 "Respiratory protection equipment -
Non-powered air-purifying particle respirator".
Compared with GB 2626-2006, the main changes in this standard are as follows:
- CHANGE the standard name from "Respiratory protection equipment -
Non-powered air-purifying particle respirator" to "Respiratory protection -
Non-powered air-purifying particle respirator";
- DELETE three terms "smoke", "fog" and "microorganism"; ADD seven
terms "penetration", "user face-seal check", "assigned protection factor",
"count median diameter", "mass median diameter", "aerodynamic
diameter", "mass median aerodynamic diameter" (see 3.14 and 3.19 ~
3.24);
- MODIFY the requirements for inspiratory resistance and expiratory
resistance of various types of respirators (see 5.5);
- MODIFY the requirements and test methods for air tightness of exhalation
valves (see 5.6.1 and 6.7);
- MODIFY the name of the exhalation valve cover to an exhalation valve
protection device (see 5.6.2 and 6.8);
- MODIFY the vision requirements for various types of respirators (see 5.8);
- ADD the requirements and test methods for products that the manufacturer
claims filter elements can be reused after cleaning and / or disinfection [see
5.14.1, 5.16d), 6.2.3];
- ADD the practical performance requirements and testing methods (see 5.15
and 6.16);
- ADD a description of the method of judging the service life of filter elements
in the information part to be provided by the manufacturer; ADD the
application restrictions on non-flame-retardant products (see 5.16);
- In the testing method of filter efficiency, ADD the conversion method of
particle size used for testing of filter efficiency (see Appendix B),
requirements for accuracy and resolution of particle detector for the filter
efficiency testing equipment (see 6.3.2) and judgment of loading end point
(see 6.3.4.4, 6.3.4.5, 6.3.4.6, Appendix C); ADD the requirements for load
(see 6.3.3);
- In the testing method of leakage, ADD requirements for sample inspection
(see 6.4.1.4); ADD the accuracy requirements for particle detectors (see
6.4.2.4); ADD a formula for calculating the inward leakage by subject [see
formula (5)];
- ADD the schematic diagram of the structure of the built-in breathing hose
for the test head mold for breathing resistance testing and dead space
testing (see Figure 4);
- In the test method of breathing resistance, MODIFY the requirements for
the micromanometer parameters (see 6.5.2.3); ADD the requirements for
airtightness between the respirator facepiece and the test head mold (see
6.5.4 and 6.6.4);
- MODIFY the schematic diagram of the testing device for dead space (see
Figure 6);
- In the test method of head harness, ADD the requirement to apply the test
tensile force in the direction in which the head harness is stretched during
normal use (see 6.11.3).
Note: See Appendix E for the main differences between this standard and the
2006 edition.
This standard was proposed by and shall be under the jurisdiction of the
Ministry of Emergency Management of the People's Republic of China.
Drafting organizations of this standard: China Iron and Steel Group Wuhan
Safety and Environmental Protection Research Institute Co., Ltd., Academy of
Military Science and Chemical Research Institute, 3M China Co., Ltd.
The main drafters of this standard: Cheng Jun, Ding Songtao, Yang Xiaobing,
Yao Hong, Zhou Xiaoping, Cai Xialin, Zhang Shouxin, Yu Jingjing.
This standard was first issued in 1981, revised to GB/T 2626-1992 in 1992, then
revised to GB 2626-2006 in 2006.
Respiratory protection - Non-powered air-purifying
particle respirator
1 Scope
This standard specifies the classification and marking, technical requirements,
testing methods, identification of non-powered air-purifying particle respirator.
This standard applies to non-powered air-purifying respirator that protects
against particle.
This standard does not apply to respirators that protect against harmful gases
and vapors. It does not apply to the respirators for hypoxic environments,
underwater operations, escape, fire-fighting.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 2890-2009 Respiratory protection - Non-powered air-purifying
respirators
GB/T 5703 Basic human body measurements for technological design
GB/T 10586 Specifications for damp heat chambers
GB/T 10589 Specifications for low temperature test chambers
GB/T 11158 Specifications for high temperature test chambers
GB/T 18664-2002 Selection, use and maintenance of respiratory protective
equipment
GB/T 23465-2009 Respiratory protective equipment - Practical performance
evaluation methods
3 Terms and definitions