标准编号:	GB 2626-2019
中文名称:	呼吸防护 自吸过滤式防颗粒物呼吸器
英文名称:	Respiratory protection—Non-powered air-purifying particle respirator
中标分类:	C73    劳动防护用品
行业分类:	GB    国家标准
ICS分类:	13.340.30 13.340.30    呼吸保护装置 13.340.30
发布机构:	国家市场监督管理总局 国家标准化管理委员会
发布日期:	2019-12-31
实施日期:	2020-7-1
标准状态:	现行
替代旧标准:	GB 2626-2006 呼吸防护用品——自吸过滤式防颗粒物呼吸器
翻译语言:	英文
文件格式:	PDF
中文字符数:	37000 字
翻译价格(元):	590.00 元
交付时间:	付款后 1 个工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.



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.



 

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

呼吸防护 自吸过滤式防颗粒物呼吸器
1 范围
本标准规定了自吸过滤式防颗粒物呼吸器的分类和标记、技术要求、检测方法和标识。
本标准适用于防护颗粒物的自吸过滤式呼吸器。
本标准不适用于防护有害气体和蒸气的呼吸器，不适用于缺氧环境、水下作业、逃生和消防用呼吸器。
2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
GB 2890—2009 呼吸防护 自吸过滤式防毒面具
GB/T 5703 用于技术设计的人体测量基础项目
GB/T 10586 湿热试验箱技术条件
GB/T 10589低温试验箱技术条件
GB/T 11158高温试验箱技术条件
GB/T 18664—2002呼吸防护用品的选择、使用与维护
GB/T 23465—2009 呼吸防护用品 实用性能评价
3术语和定义
下列术语和定义适用于本文件。
3.1
颗粒物particle
悬浮在空气中的固态、液态或固态与液态混合的颗粒状物质，如粉尘、烟、雾和微生物。
[GB/T 18664—2002，定义3.1.15]
3.2
粉尘dust
悬浮在空气中的微小固体颗粒物，一般由固体物料受机械力作用破碎而产生。
[GB/T 18664—2002，定义3.1.16]
3.3
自吸过滤式呼吸器non-powered air-purifying respirator
靠佩戴者呼吸克服部件气流阻力的过滤式呼吸器。
[GB/T 18664—2002，定义3.1.3]
3.4
密合型面罩tight-fitting facepiece
能罩住口和鼻，与面部密合的面罩，或能罩住眼睛、口和鼻，与头面部密合的面罩。
注1：密合型面置分半面置和全面置。
注2：改写GB/T 18664—2002，定义3.1.5。
3.5
半面罩half facepiece
能覆盖口和鼻，或覆盖口、鼻和下颌的密合型面罩。
注：半面罩分随弃式面罩和可更换式半面罩。
3.6
全面罩 full facepiece
能覆盖眼睛、口、鼻和下颌的密合型面罩。
3.7
随弃式面罩disposable facepiece
主要是由滤料构成面罩主体的一种半面罩，可设呼气阀。
3.8
可更换式面罩replaceable facepiece
有单个或多个可更换过滤元件的密合型半面罩和全面罩，可设呼吸气阀和/或呼吸导管。
3.9
吸气阀 inhalation valve
只允许吸入气体通过其进入面罩，防止呼出气体通过它排出面罩的单向阀门。
[GB 2890—2009，定义3.6]
3.10
呼气阀 exhalation valve
只允许呼出气体通过其排出面罩，防止吸入气体通过它进入面罩的单向阀门。
[GB 2890—2009，定义3.7]
3.11
呼吸导管breathing hose
用于连接面罩与过滤元件的柔软、气密的导气管。
3.12
过滤元件 filter element
过滤式呼吸器使用的，可滤除吸入空气中有害物质的过滤材料或过滤组件。
示例：滤毒罐(滤毒盒)、滤尘盒、滤料等。
[GB/T 18664—2002，定义3.1.22]
3.13
过滤效率 filter efficiency
在规定检测条件下，过滤元件滤除颗粒物的水平。
3.14
穿透率penetration
在规定检测条件下，颗粒物穿透过滤元件的水平。
注：穿透率=100％-过滤效率。
3.15
总泄漏率total inward leakage；TIL
在规定的实验室检测环境下，受试者吸气时从包括过滤元件在内的所有面罩部件泄漏入面罩内的模拟剂的浓度与呼吸器面罩外测试环境中模拟剂浓度的比值。
总泄漏率=Ci/C0×100％ (1)
式中：
Ci——呼吸器面罩内模拟剂的浓度；
C0——呼吸器面罩外测试环境中模拟剂的浓度。
3.16
泄漏率inward leakage；IL
在规定的实验室检测环境下，受试者吸气时从除过滤元件以外的面罩所有其他部件泄漏入面罩内的模拟剂浓度与呼吸器面罩外测试环境中模拟剂浓度的比值。
泄漏率=Ci/C0×100％ (2)
式中：
Ci——呼吸器面罩内模拟剂的浓度；
C0——呼吸器面罩外测试环境中模拟剂的浓度。
3.17
死腔dead space
从前一次呼气中被重新吸入的二氧化碳气体的体积分数。
3.18
头带head harness
用于将面罩固定在头部的部件。
3.19
佩戴气密性检查user face-seal check
由呼吸器佩戴者自己进行的一种简便的密合性检查方法，用以确保密合型面罩佩戴正确。
注：改写GB/T 18664—2002，定义3.1.24。
3.20
指定防护因数assigned protection factor
一种或一类适宜功能的呼吸防护用品，在适合使用者佩戴且正确使用的前提下，预期能将空气污染物浓度降低的水平。
注：改写GB/T 18664—2002，定义3.1.29。
3.21
计数中位径count median diameter；CMD
当把颗粒物按粒径大小排序时，比它粒径大的和比它粒径小的颗粒物个数各占颗粒物总数量50％的粒径。
3.22
质量中位径mass median diameter；MMD
当把颗粒物按粒径大小排序时，比它粒径大的和比它粒径小的颗粒物质量各占颗粒物总质量50％的粒径。
3.23
空气动力学粒径 aerodynamic diameter
与所考虑的颗粒物有相同沉降速度的单位密度球形颗粒的直径。
3.24
空气动力学质量中位径mass median aerodynamic diameter；MMAD
当把颗粒物按空气动力学粒径大小排序时，比它粒径大的和比它粒径小的颗粒物质量各占颗粒物总质量50％的粒径。
4分类和标记
4.1面罩分类
面罩按结构分为随弃式面罩、可更换式半面罩和全面罩三类。
4.2过滤元件分类
过滤元件按过滤性能分为KN和KP两类，KN类只适用于过滤非油性颗粒物，KP类适用于过滤油性和非油性颗粒物。
4.3过滤元件级别
根据过滤效率水平，过滤元件的级别按表1分级。
表1 过滤元件的级别
过滤元件类型 面罩类别
随弃式面罩 可更换式半面罩 全面罩
KN类 KN90
KN95
KN100 KN90
KN95
KN100
KN95
KN100
KP类 KP90
KP95
KP100 KP90
KP95
KP100
KP95
KP100

4.4标记
随弃式面罩和可更换式面罩的过滤元件应标注级别，级别用本标准编号与过滤元件类型和级别的组合方式标注。
示例1：KN90过滤元件的标记为GB 2626—2019 KN90。
示例2：KP100过滤元件的标记为GB 2626—2019 KP100。
5 技术要求
5.1 基本要求
按照6.1方法检查，并在6.16中评价，呼吸器的材料和结构设计应符合以下要求：
a)材料应符合以下要求：
1)直接与面部接触的材料对皮肤应无害；
2)滤料对人体应无害；
3)所用材料应具有足够的强度，在正常使用中不应出现破损和影响使用效果的变形；
4)佩戴时不应产生明显的压痛或刺痛感。
b)结构设计应符合以下要求：
1)应不易产生结构性破损，部件的设计、组成和安装不应对使用者构成任何危险；
2)头带的设计应为弹性材料或可调，便于佩戴和摘除，应能将面罩牢固地固定在脸上，且佩戴时不应出现明显的压迫或压痛现象，可更换式半面罩和全面罩的头带设计应为可更换；
3)同一大小号码和相同款式的面罩若有不同的佩戴方式，应作为不同的产品检测；
注1：同款式面罩的不同佩戴方式会影响到面罩的密合性。
4)不应明显影响视野；
5)在佩戴时，全面罩的镜片不应出现结雾等影响视觉的情况；
6)使用可更换过滤元件、吸气阀、呼气阀以及头带的呼吸器应采用方便更换的设计，并且能使佩戴者随时和方便地检查面罩与面部的气密性，做佩戴气密性检查；
注2：佩戴气密性检查方法见GB/T 18664—2002附录G。
7)呼吸导管不应限制头部活动或佩戴者的行动，不应影响面罩的密合性，不应出现限制、阻塞气流的情况；
8)应对呼气阀的正面设置保护，呼气阀保护装置可以是专设的一个部件，也可以借助面罩上其他的部件起到保护作用；
9)随弃式面罩的结构应能保证与面部的密合，且应在正常使用中不出现变形；
10)可更换式面罩的部件(除过滤元件)应可清洗。
5.2 外观检查
按照6.1方法检查。
样品表面不应破损、变形和有明显的其他缺陷，部件材料和结构应能耐受正常使用条件及可能遇到的温度、湿度和机械冲击。按照6.2方法经温度湿度预处理和机械强度预处理后，部件不应脱落、损坏和变形。检查内容还应包括标识和制造商所提供的各种信息。
5.3 过滤效率
用氯化钠(NaCl)颗粒物检测KN类过滤元件，用邻苯二甲酸二辛酯(DOE，dioctyl phthalate)或性质相当的油类颗粒物(如石蜡油)检测KP类过滤元件。
按照6.3方法检测。
在检测过程中，每个样品的过滤效率应始终符合表2的要求。
表2过滤效率
过滤元件的类别和级别 用氯化钠颗粒物检测 用油类颗粒物检测
KN90 ≥90.0％ 不适用
KN95 ≥95.0％
KN100 ≥99.97％
KP90 不适用 ≥90.0％
KP95 ≥95.0％
KP100 ≥99.97％

5.4 泄漏性
5.4.1 随弃式面罩的TIL
按照6.4方法检测。随弃式面罩的TIL应符合表3的要求。
表3 随弃式面罩的TIL
滤料级别 以每个动作的TIL为评价基础时(即10人×5个动作)，50个动作中至少有46个动作的TIL 以人的总体TIL为评价基础时，10个受试者中至少有8个人的总体TIL
KN90或KP90 <13％ <10％
KN95或KP95 <11％ <8％
KN100或KP100 <5％ <2％

5.4.2 可更换式半面罩的IL
按照6.4方法检测。当以每个动作的IL为评价基础时(即10人×5个动作)，50个动作中至少有46个动作的IL应小于5％；并且，在以人的总体IL为评价基础时，10个受试者中至少有8个人的总体IL应小于2％。
5.4.3全面罩的IL
按照6.4方法检测。当以每个动作的IL为评价基础时(即10人×5个动作)，每个动作的IL应小于0.05％。
5.5呼吸阻力
按照6.5和6.6方法检测。
各类呼吸器的吸气阻力和呼气阻力应符合表4的要求。
表4呼吸阻力要求
面罩类别 吸气阻力/Pa 呼气阻力/Pa
KN90和KP90 KN95和KP95 KN100和KP100
随弃式面罩，无呼气阀 ≤170 ≤210 ≤250 同吸气阻力
随弃式面罩，有呼气阀 ≤210 ≤250 ≤300 ≤150
包括过滤元件在内的可更换式半面罩和全面罩 ≤250 ≤300 ≤350

5.6 呼气阀
5.6.1 呼气阀气密性
只检测半面罩。呼气阀应符合以下要求：
按照6.7方法检测，每个呼吸器的呼气阀的泄漏气流量不应大于30 mL/min；若面罩设有多个呼气阀，每个呼气阀应符合的泄漏气流量应均分，例如，若呼吸器面罩设置了2个呼气阀，则每个呼气阀的泄漏气流量都不应大于15 mL/min。
5.6.2呼气阀保护装置
按照6.8方法检测。
呼气阀保护装置在承受表5规定的轴向拉力时，不应出现滑脱、断裂和变形。
表5呼气阀保护装置应承受的轴向拉力
面罩种类 随弃式面罩 可更换式面罩
拉力 10 N，持续10 s 50 N，持续10 s

5.7 死腔
按照6.9方法检测。
呼吸器的死腔结果平均值不应大于1％。
5.8视野
按照6.10方法检测。
呼吸器的视野应符合表6的要求。
表6视野
视野 面罩类别
半面罩 全面罩
大眼窗 双眼窗
下方视野 ≥35° ≥35° ≥35°
总视野 不适用 ≥70％ ≥65％
双目视野 ≥65％ ≥55％ ≥24％

5.9 头带
按照6.11方法检测。
呼吸器的每条头带、带扣及其他调节部件在承受表7规定的拉力时，不应出现滑脱或断裂。
表7 头带应承受的拉力
面罩种类 随弃式面罩 可更换式半面罩 全面罩
拉力 10 N，持续10 s 50 N，持续10 s 150 N，持续10 s

5.10连接和连接部件
按照6.12方法检测。
在规定检测条件下，可更换式过滤元件与面罩之间，呼吸导管与过滤元件及面罩之间的所有连接和连接部件，在承受表8规定的轴向拉力时，不应出现滑脱、断裂或变形。
表8连接和连接部件应承受的轴向拉力
面罩种类 可更换式半面罩 全面罩
拉力 50 N，持续10 s 250 N，持续10 s

5.11 镜片
5.11.1 只检测全面罩。
5.11.2按照6.13方法检测，每个样品的镜片不应破碎或产生裂纹；然后按6.14方法检测气密性，应符合5.12的要求。
5.11.3按照6.16方法检测，镜片不应导致视物变形。
5.11.4 如果产品增设保明贴片，或设计使用防雾剂，防雾剂不应使用已知的对人有害的物质；在使用保明贴片和/或防雾剂后，不应导致视物变形和模糊，防雾剂不应对人产生刺激和其他不适，按照6.1和6.16方法检测。
5.12气密性
按照6.14方法检测。
在规定检测条件下，60 s内每个全面罩内的压力变化不应大于100 Pa。
5.13 可燃性
5.13.1若产品设计不阻燃，应按照5.16c)1)的要求提供说明信息。
5.13.2若产品设计阻燃，应按照6.15方法检测。暴露于火焰的各部件在从火焰移开后，继续燃烧时间不应超过5 s。
5.14清洗和消毒
5.14.1若产品设计允许过滤元件在清洗和/或消毒后重复使用，应符合5.16d)的要求，并且过滤元件应能够耐受制造商推荐的清洗或消毒的处理，清洗或消毒后的样品应符合5.3对过滤效率、5.4对泄漏性和5.5中对吸气阻力的要求。制造商提供使用者判断清洗或消毒后过滤元件继续有效的方法应正确和有效。
5.14.2对可更换式面罩，面罩应能够耐受制造商推荐的清洗或消毒的处理；清洗或消毒后的样品应符合5.4的要求。
5.15实用性能
按6.16方法检测，在模拟使用的条件下，对其他检测方法难以评价的性能，如5.1b)和5.11中规定的性能，由受试者提供主观评价。
若呼吸器不能通过检测，实验室应详细描述检测方法，便于其他实验室能够重复该检测过程。
5.16 制造商应提供的信息
按照6.1方法检查。
应按照GB/T 18664—2002的有关规定判断制造商提供信息的正确性。
制造商提供的信息应符合以下要求：
a)应随最小销售包装一起提供。
b)应有中文说明。
c)应包括使用者必需了解的以下信息：
1)应用范围与限制，应包括(但不限于)适用的颗粒物类别(如是否含油)，呼吸器的指定防护因数，和/或其他不适用的应用环境；如果产品设计不阻燃，应有“本产品不适合存在明火的作业场所(如焊接、铸造等)”的文字说明；
2)对可更换过滤元件，说明其与全面罩或半面罩一起使用的方法，若为多重滤料，应标明；
3)可更换式面罩的组装方法；
4)使用前的检查方法；
5)佩戴方法和做佩戴气密性检查的方法；
6)对随弃式面罩，判断其使用寿命的方法；
7)对可更换式面罩，提供何时更换面罩或过滤元件的建议；
8)如果适用，维护方法(如清洗和消毒方法)；
9)储存方法；
10)使用的任何符号和图标的含义。
d)如果产品宣称过滤元件可清洗和/或消毒后重复使用，应提供以下信息：
1)适用的颗粒物的具体特征和/或范围；
2)可清洗和/或消毒的最大次数；
3)判断过滤元件清洗、消毒后是否继续有效和何时更换的方法。
e)应对使用中可能遇到的问题提供警示，如：
1)与佩戴者面部的适合性；
2)密合框下的毛发会导致面罩泄漏；
3)空气质量(污染物、缺氧等)。
f)信息应明确，可增加解说、部件号和标注等帮助说明。
5.17 包装
按照6.1方法检查。
销售用包装应能保护产品，防止在使用前受到机械损伤和污染。
6检测方法
6.1 表观检查
根据各技术要求的需要(参见附录A)，在进行实验室性能检测前，应对样品进行目测外观检查。
6.2预处理
6.2.1 温度湿度预处理
6.2.1.1 样品数量及要求
2个未处理样；或其他检测方法所要求的数量。
6.2.1.2检测设备
检测设备应符合以下要求：
a)高温试验箱技术性能应符合GB/T 11158的要求；
b)低温试验箱技术性能应符合GB/T 10589的要求；
c)湿热试验箱技术性能应符合GB/T 10586的要求。
6.2.1.3检测方法
将样品从原包装中取出，顺序按下述条件处理：
a)在(38±2.5)℃和(85±5)%相对湿度环境放置(24±1)h；
b)在(70±3)℃干燥环境放置(24±1)h；
c)在(-30±3)℃环境放置(24±1)h。
采用的预处理方式应避免产生热冲击，使样品温度恢复至室温后至少4 h，再进行后续预处理或检测。
6.2.2机械强度预处理
6.2.2.1 样品数量及要求
仅适用于可更换式过滤元件。2个未处理样；或其他检测方法所要求的数量。
6.2.2.2 检测设备
振动试验装置示意见图1。该装置由放置样品的钢制箱体、钢制平台、凸轮及驱动、控制系统组成；钢制箱体固定在可垂直移动的支架上，通过凸轮转动，使钢制箱体提升20 mm，然后靠自身重量落在一钢制平台上，产生一次振动；钢制箱体质量应大于10 kg，钢制平台的质量应至少是钢制箱体质量的10倍；凸轮转动频率为(100±5)r/min。
6.2.2.3 检测方法