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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 2626-2006 Respiratory protective equipment - non-powered air-purifying particle respirator.
The following main changes have been made with respect to GB 2626-2006:
——the standard name is changed from Respiratory protective equipment - non-powered air-purifying particle respirator to Respiratory protection - Non-powered air-purifying particle respirator.
——three terms of "fume", "mist" and "microorganism" are deleted; seven terms of "penetration", "user face-seal check", "assigned protection factor", "count median diameter", "mass median diameter", "aerodynamic diameter" and "mass median aerodynamic diameter" are added (see 3.14 and 3.19~3.24);
——the requirements for inhalation resistance and exhalation resistance of various respirators are modified (see 5.5);
——the requirements and testing methods for airtightness of exhalation valve are modified (see 5.6.1 and 6.7);
——the exhalation valve cap is renamed as exhalation valve protection device (see 5.6.2 and 6.8);
——the requirements for fields of view of various respirators are modified (see 5.8);
——the requirements and testing methods for products declared by the manufacturer that the filter elements may be reused after cleaning and/or disinfection [see 5.14.1 and 5.16d) and 6.2.3];
——the requirements and testing methods for practical performance are added (see 5.15 and 6.16);
——the description of the judgment method for the service life of filter element is added in the information to be provided by the manufacturer, and the application limit is added for non-flame-retardant products (see 5.16);
——for the purpose of filter efficiency testing method, the conversion method of particle diameter for filter efficiency testing (see Annex B), the precision and resolution requirements of particle tester of filter efficiency testing equipment (see 6.3.2) and the judgment method for loading finish point (see 6.3.4.4, 6.3.4.5, 6.3.4.6 and Annex C) are added, and the requirements for loading capacity are also added (see 6.3.3);
——for the purpose of leakage testing method, the requirements for sample inspection (see 6.4.1.4), the precision requirements for particle tester (see 6.4.2.4) and the equation for calculating inward leakage according to the testee [see Equation (5)] are added;
——the schematic diagram for structure of breathing hose built in the test head model for respiratory resistance and dead space testing is added (see Figure 4);
——for the purpose of respiratory resistance testing method, the requirements for micromanometer parameters (see 6.5.2.3) are modified, and the requirements for airtightness between respirator facepiece and test head model are added (see 6.5.4 and 6.6.4);
——the schematic diagram for dead space testing device is modified (see Figure 6);
——for the purpose of head harness testing method, the requirement to apply the test tension according to the direction in which the head harness is stretched during normal use is added (see 6.11.3).
Note: see Annex E for the main differences between this standard and Edition 2006.
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
This standard was issued in 1981 as first edition, revised to GB/T 2626-1992 in 1992 and 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 method and identification of non-powered air-purifying particle respirator.
This standard is applicable to non-powered air-purifying particle respirator.
This standard is not applicable to respirators used for preventing harmful gas and vapor and those used in oxygen-deficient environment, underwater operation, escape and fire protection.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 testing 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
For the purpose of this document, the following terms and definitions apply.
3.1
particle
solid, liquid or solid-liquid granular material suspending in the air, e.g., dust, fume, mist and microorganism
[GB/T 18664-2002, Definition 3.1.15]
3.2
dust
fine solid particle suspending in the air, generally generated by solid materials through mechanical crushing
[GB/T 18664-2002, Definition 3.1.16]
3.3
non-powered air-purifying respirator
air-purifying respirator overcoming the airflow resistance of the component by virtue of the user's respiration
[GB/T 18664-2002, Definition 3.1.3]
3.4
tight-fitting facepiece
facepiece capable of covering the nose and mouth and fitting with the face or that capable of covering the eyes, mouth and nose and fitting with the head and face
Note 1: the tight-fitting facepieces are classified into half facepieces and full facepieces.
Note 2: it is revised from Definition 3.1.5, GB/T 18664-2002.
3.5
half facepiece
tight-fitting facepiece capable of covering mouth and nose, or covering mouth, nose and lower jaw
Note: the half facepieces are classified into disposable facepieces and replaceable half facepieces.
3.6
full facepiece
tight-fitting facepiece capable of covering eyes, mouth, nose and lower jaw
3.7
disposable facepiece
half facepiece mainly composed of filter material, which may be equipped with exhalation valve
3.8
replaceable facepiece
tight-fitting half/full facepiece with single or multiple replaceable filter elements, which may be equipped with inhalation and/or exhalation valve or breathing hose
3.9
inhalation valve
one-way valve only allowing inhaled air to enter into but preventing exhaled air discharging through the facepiece
[GB 2890-2009, Definition 3.6]
3.10
exhalation valve
one-way valve only allowing exhaled air to be discharged through but preventing inhaled air entering into the facepiece
[GB 2890-2009, Definition 3.7]
3.11
breathing hose
flexible and airtight hose used for connecting facepiece and filter element
3.12
filter element
filter material or filter assembly used for the air-purifying respirator for filtering the harmful substances in the inhaled air
Example: canister (toxicant filter box), dust filter box, filter material, etc.
[GB/T 18664-2002, Definition 3.1.22]
3.13
filter efficiency
efficiency for filter element filtering particles under specified testing conditions
3.14
penetration
efficiency for particle penetrating filter element under specified testing conditions
Note: penetration = 100% - filter efficiency.
3.15
total inward leakage; TIL
ratio of the concentration of simulated agent leaked into the facepiece from all facepiece components (including filter element) during the inhalation process to that of simulated agent in the testing environment outside the respirator facepiece under the specified laboratory testing environment
Total inward leakage=Ci/C0×100% (1)
Where,
Ci——the concentration of simulated agent in respirator facepiece;
C0——the concentration of simulated agent in the testing environment outside respirator facepiece.
3.16
inward leakage; IL
ratio of the concentration of simulated agent leaked into the facepiece from all facepiece components (excluding filter element) during the inhalation process to that of simulated agent in the testing environment outside the respirator facepiece under the specified laboratory testing environment
Inward leakage=Ci/C0×100% (2)
Where,
Ci——the concentration of simulated agent in respirator facepiece;
C0——the concentration of simulated agent in the testing environment outside respirator facepiece.
3.17
dead space
volume fraction of carbon dioxide gas inhaled from the exhaled air at the former time
3.18
head harness
component used for fixing the facepiece on head
3.19
user face-seal check
a kind of simple and convenient fitting inspection carried out by respirator user to ensure that the tight-fitting facepiece is worn correctly.
Note: it is revised from Definition 3.1.24, GB/T 18664-2002.
3.20
assigned protection factor
a kind or type of respiratory protective equipment with appropriate function, which is expected to reduce the air pollutant concentration when correctly worn and used by the user
Note: it is revised from Definition 3.1.29, GB/T 18664-2002.
3.21
count median diameter; CMD
diameter of the particle that the quantity of particles larger than it and that smaller than it respectively account for 50% of the total quantity of particles when sorted according to diameter
3.22
mass median diameter; MMD
diameter of the particle that the mass of particles heavier than it and that lighter than it respectively account for 50% of the total mass of particles when sorted according to diameter
3.23
aerodynamic diameter
diameter of spherical particle per unit density with the same settling velocity as the particle under consideration
3.24
mass median aerodynamic diameter; MMAD
diameter of the particle that the mass of particles heavier than it and that lighter than it respectively account for 50% of the total mass of particles when sorted according to aerodynamic diameter
4 Classification and marking
4.1 Facepiece classification
Facepieces are classified into disposable facepieces, replaceable half facepieces and full facepieces by structure.
4.2 Filter element classification
Filter elements are classified into Type KN and Type KP by filtering performance; wherein, the former is only applicable to non-oil particles while the latter is applicable to oil and non-oil particles.
4.3 Filter element grading
According to the filter efficiency, the filter elements are graded according to those specified in Table 1.
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Table 1 Filter element grades
Filter element type Type of facepiece
Disposable facepiece Replaceable half facepiece Full facepiece
Type KN KN90
KN95
KN100 KN90
KN95
KN100
KN95
KN100
Type KP KP90
KP95
KP100 KP90
KP95
KP100
KP95
KP100
4.4 Marking
As for the disposable facepiece and replaceable facepiece, their filter elements shall be marked with grades in the form of combining the number of this standard and the type and grade of the filter element.
Example 1: KN90 filter element is marked as GB 2626-2019 KN90.
Example 2: KP100 filter element is marked as GB 2626-2019 KP100.
5 Technical requirements
5.1 Basic requirements
Where inspected according to the method in 6.1 and evaluated according to 6.16, the material and structure design of respirator shall meet the following requirements:
a) the material shall meet the following requirements:
1) the material directly exposed to face shall be harmless to the skin;
2) the filter material shall be harmless to human body;
3) the material used shall have sufficient strength, and be free from damage or deformation that affects the normal use;
4) no obvious tenderness or tingling shall occur during wearing.
b) the structure design shall meet the following requirements:
1) it shall be hard to generate structural damage; the component design, composition and installation shall not endanger the user;
2) the head harness shall be designed to be elastic or adjustable, for the convenience of wearing and removing; it shall be able to fix the facepiece to the face firmly, free from obvious oppression or tenderness; the head harness of replaceable half facepiece and full facepiece shall be designed to be replaceable;
3) the facepieces of the same size and style shall be tested as different products if they are worn in different methods;
Note 1: different wearing methods of facepieces of the same style will affect fitting.
4) it shall not significantly affect the field of view;
5) during wearing, the lens of full facepiece shall be free from atomization or other conditions affecting the visual effect;
6) the respirator equipped with replaceable filter element, inhalation valve, exhalation valve and head harness shall be designed to be convenient for replacement, and can enable the user to carry out user face-seal check conveniently at any time;
Note 2: see Annex G, 18664-2002 for the for user face-seal check method.
7) the breathing hose shall not restrict the head movement or the user's action, not affect the fitting of facepiece, and be free of air flow restriction or blocking;
8) protection shall be provided on the front of the exhalation valve, for which, a special component may be arranged, and other components on the facepiece may also be used;
9) the disposable facepiece structure shall ensure the tight fitting with face, and be free from deformation during normal use.
10) the components (except filter element) of replaceable facepiece shall be cleanable.
5.2 Appearance inspection
Appearance is inspected according to the method specified in 6.1.
The sample shall be free from damage, deformation and other obvious defects on surface; the component material and structure shall be able to withstand the normal use conditions as well as possible temperature, humidity and mechanical impact. After being pretreated in terms of temperature, humidity and mechanical strength in accordance with the method specified in 6.2, the components shall be free from shedding, damage or deformation. Inspection contents shall also cover various information provided in the identification and by the manufacturer.
5.3 Filter efficiency
Type KN filter elements shall be tested with sodium chloride (NaCl) particles; Type KP filter elements shall be tested with dioctyl phthalate (DOP) or equivalent oil particles (e.g. paraffin oil).
The filter efficiency shall be tested according to the method specified in 6.3.
During the testing process, the filter efficiency of each sample shall always be in accordance with those specified in Table 2.
Table 2 Filter efficiency
Type and grade of filter element Testing with sodium chloride particle Testing with oil particle
KN90 ≥90.0% Not applicable
KN95 ≥95.0%
KN100 ≥99.97%
KP90 Not applicable ≥90.0%
KP95 ≥95.0%
KP100 ≥99.97%
5.4 Leakage
5.4.1 TIL of disposable facepiece
The TIL of disposable facepiece shall be tested according to the method specified in 6.4. The TIL of disposable facepiece shall be in accordance with those specified in Table 3.
Table 3 TIL of disposable facepiece
Filter material grade TIL of at least 46 actions of 50 actions in all, in the case of TIL of each action as the evaluation basis (namely 10 testees * 5 actions) Total TIL of at least 8 testees of 10 testees in all, in the case of total TIL of each testee as the evaluation basis
KN90 or KP90 <13% <10%
KN95 or KP95 <11% <8%
KN100 or KP100 <5% <2%
5.4.2 IL of replaceable half facepiece
The IL of replaceable half facepiece shall be tested according to the method specified in 6.4. IL of at least 46 actions of 50 actions in all shall be less than 5%, in the case of IL of each action as the evaluation basis; total IL of at least 8 testees of 10 testees in all shall be less than 2%, in the case of total IL of each testee as the evaluation basis.
5.4.3 IL of full facepiece
The IL of full facepiece shall be tested according to the method specified in 6.4. IL of each action shall be less than 0.05%, in the case of IL of each action as the evaluation basis (namely 10 testees * 5 actions).
5.5 Respiratory resistance
The respiratory resistance shall be tested according to the methods specified in 6.5 and 6.6.
The inhalation resistance and exhalation resistance of various respirators shall meet the requirements of Table 4.
Table 4 Requirements for respiratory resistance
Type of facepiece Inhalation resistance/Pa Exhalation resistance /Pa
KN90 and KP90 KN95 and KP95 KN100 and KP100
Disposable facepiece without exhalation valve ≤170 ≤210 ≤250 The same as inhalation resistance
Disposable facepiece with exhalation valve ≤210 ≤250 ≤300 ≤150
Disposable half and full facepieces with filter elements ≤250 ≤300 ≤350
5.6 Exhalation valve
5.6.1 Airtightness of exhalation valve
Only half facepiece is tested. The exhalation valve shall meet the following requirements:
It shall be tested according to the method specified in 6.7, and the leaked air flow of exhalation valve of each respirator shall not be greater than 30mL/min; if the facepiece is equipped with multiple exhalation valves, the above-mentioned leaked air flow (not greater than 30mL/min) shall be evenly shared by each one, e.g., if the respirator facepiece is equipped with two exhalation valves, the leaked air flow of each one shall not be greater than 15mL/min.
5.6.2 Exhalation valve protection device
It shall be tested according to the method specified in 6.8.
Under the axial tension specified in Table 5, the exhalation valve protection device shall be free from slippage, fracture or deformation.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and marking
4.1 Facepiece classification
4.2 Filter element classification
4.3 Filter element grading
4.4 Marking
5 Technical requirements
5.1 Basic requirements
5.2 Appearance inspection
5.3 Filter efficiency
5.4 Leakage
5.5 Respiratory resistance
5.6 Exhalation valve
5.7 Dead space
5.8 Field of view
5.9 Head harness
5.10 Connection and connecting components
5.11 Lens
5.12 Airtightness
5.13 Combustibility
5.14 Cleaning and disinfection
5.15 Practical performance
5.16 Information provided by the manufacturer
5.17 Packaging
6 Testing method
6.1 Visual inspection
6.2 Pretreatment
6.3 Filter efficiency
6.4 Leakage
6.5 Inhalation resistance
6.6 Exhalation resistance
6.7 Airtightness of exhalation valve
6.8 Exhalation valve protection device
6.9 Dead space
6.10 Field of view
6.11 Head harness
6.12 Connection and connecting components
6.13 Lens
6.14 Airtightness
6.15 Combustibility
6.16 Practical performance
7 Product marking
7.1 Markings on products
7.2 Markings on package
Annex A (Informative) Summary for testing requirements
Annex B (Informative) Method for converting CMD to MMAD
Annex C (Normative) Method for judging the continuous filter efficiency decrease of KP filter element under loaded conditions
Annex D (Normative) Main dimensions of test head model
Annex E (Informative) Main differences between this standard and that in Edition
Bibliography
