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GB 2890-2022: Respiratory protection -- Non-powered air-purifying gas mask
GB 2890-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.30
CCS C 73
Replacing GB 2890-2009
Respiratory protection - Non-powered air-purifying gas
mask
ISSUED ON: DECEMBER 29, 2022
IMPLEMENTED ON: JANUARY 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Classification and marking ... 9
5 Technical requirements ... 10
6 Test methods ... 17
7 Marking, packaging, information provided by the manufacturer ... 19
Appendix A (Informative) Summary of testing requirements ... 22
Appendix B (Normative) Pretreatment method ... 24
Appendix C (Normative) Main dimensions of test headform ... 26
Appendix D (Normative) Test method of mask ... 27
Appendix E (Normative) Filter test method ... 39
Appendix F (Normative) Practical performance test method ... 55
References ... 56
Respiratory protection - Non-powered air-purifying gas
mask
1 Scope
This document specifies the classification and sign, technical requirements, marking,
packaging and information provided by the manufacturer of non-powered air-purifying
gas masks; describes the test methods.
This document applies to gas masks based on the non-powered air-purifying principle.
This document does not apply to non-powered air-purifying gas masks, which are used
in hypoxic environments, underwater operations, escape and firefighting hot zones.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 2428-1998 Head-face dimensions of adults
GB 2626-2019 Respiratory protection - Non-powered air-purifying particle
respirator
GB/T 5703-2010 Basic human body measurements for technological design
GB/T 10586-2006 Specifications for damp heat chambers
GB/T 10589-2008 Specifications for low temperature test chambers
GB/T 11158-2008 Specifications for high temperature test chambers
GB/T 12903-2008 Personal protective equipment terminology
GB/T 23465-2009 Respiratory protective equipment - Practical performance
evaluation methods
GB 30864-2014 Respiratory protection - Powered air-purifying respirator
Filters with the function of preventing particulate matter are divided into two categories:
KN and KP, according to the different properties of protecting particulate matter. The
category KN is only suitable for filtering non-oily particles; the category KP is suitable
for filtering oily and non-oily particles.
4.3.2 Filter level
4.3.2.1 Filter protective time
Filters are divided into level 1, level 2, level 3 according to the different protective time
and from low to high.
4.3.2.2 Particulate matter protection performance of combined filters
The particle protection performance of combined filters is divided into KN90, KP90,
KN95, KP95, KN100, KP100 according to the type of protective particles and filtration
efficiency.
4.3.3 Marking
The marking of the gas filter consists of the gas filter protection gas type, gas filter
protective time level, particle protection performance level (when applicable). The
particle protection performance level is marked on the anti-particulate matter
component; the protective gas type and filter level are marked on the anti-toxic gas
and/or vapor component, on the combined filter.
Example 1: Level 1 type A ordinary filter is marked as: A1.
Example 2: Level 2 multifunctional filter with protection against two types of gases, A and B,
is marked as: A2B2.
Example 3: Level 1 type E KN95 integrated combined filter is marked as: E1KN95.
Example 4: Used to protect some special compounds marked as: SX-(protective gas name).
5 Technical requirements
5.1 Mask
5.1.1 General requirements for masks
The structure and design of the mask shall meet the following requirements, be
inspected according to the method specified in 6.2, evaluated in 6.23:
a) Mask materials shall be non-toxic, non-irritating, harmless to health;
b) The surface of the metal material on the mask shall be subject to anti-corrosion
treatment;
c) The edges of the mask shall be smooth, without obvious edges and burrs, or
defects that affect air tightness;
d) The mask shall fit tightly on the wearer's face without obvious tenderness; the
fixing system of the mask shall be adjustable according to the wearer's needs;
e) The mask shall enable the wearer to check the air tightness between the mask and
the face at any time and conveniently, meanwhile perform air tightness inspection;
f) The observation window of the mask shall see objects realistically; measures shall
be taken to prevent lens fogging;
g) The exhalation valve shall have exhalation valve protection devices or measures
to protect it from damage; the exhalation valve shall be able to work normally;
h) Replaceable parts on the mask shall be easy to replace;
i) For a mask equipped with a breathing hose, the breathing hose shall not restrict
head movement or the wearer's movements, shall not affect the tightness of the
mask, shall not restrict or block the airflow.
5.1.2 Mask adaptability to high and low temperatures
When tested according to the method specified in 6.3, the mask shall have no obvious
deformation; the connecting part shall be able to be connected to the gas filter (breathing
hose), according to the method provided by the manufacturer.
5.1.3 Mask flammability
When tested according to the method specified in 6.4, each component exposed to the
flame shall not burn after being removed from the flame; if burning, the afterburning
time shall not exceed 5 s.
5.1.4 Mask exhalation valve
5.1.4.1 Mask exhalation valve protection device
When tested according to the method specified in 6.5, the exhalation valve protection
device shall not slip, break or deform, when it withstands an axial tension of 50 N for
10 seconds.
5.1.4.2 Air tightness of mask exhalation valve
Only half masks are tested according to the method specified in 6.6. When the
exhalation valve is depressurized to -1180 Pa, the time for the exhalation valve to return
to normal pressure shall not be less than 20 s.
Only full-face masks are tested. The observation windows of full-face masks shall meet
the following requirements:
a) When tested according to the method of 6.11, the light transmittance (visible light
transmittance) of the lens shall not be less than 85%;
b) Test according to the method in 6.12. The lens shall not come into contact with
the eyes of the headform and shall not fall off or break.
5.1.10 Bonding strength of mask and gas filter
Test according to the method in 6.13. The test results shall comply with the following
requirements:
a) The bonding force between the full mask and the filter joint shall not be less than
250 N; there shall be no obvious damage;
b) The bonding force between the half mask and the filter joint shall not be less than
50 N; there shall be no obvious damage;
c) For a full-face mask with a breathing hose, the binding force between the
breathing hose and the full-face mask shall not be less than 50 N; there shall be
no obvious damage.
5....