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GB 2890-2009 English PDF (GB2890-2009)

GB 2890-2009 English PDF (GB2890-2009)

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GB 2890-2009: Respiratory protection -- Non-powered air-purifying respirators

GB 2890-2009
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.30
C 73
Replacing GB 2890-1995, GB/T 2891-1995, GB/T 2892-1995
Respiratory Protection -
Non-Powered Air-purifying Respirators
ISSUED ON: APRIL 13, 2009
IMPLEMENTED ON: DECEMBER 1, 2009
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration (SAC) of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms ... 6
4 Classification and Designation ... 7
5 Technical Requirements ... 9
6 Test Method for mask ... 16
7 Filter test method ... 31
8 Inspection Rules ... 60
9 Identification ... 62
Appendix A (Informative) Comparison table of filter types and those in the former standard ... 64
Appendix B (Informative) Main dimension of test head-form ... 65
Appendix C (Informative) Summary of test requirements ... 66
Bibliography ... 68
Respiratory Protection -
Non-Powered Air-purifying Respirators
1 Scope
This standard specifies the classification and designation, technical requirements, mask test methods, filter test method, inspection rules and marking of non-powered air-purifying respirators.
This standard is applicable to the respirators based on the non-powered air-purifying principle.
This standard is not applicable to the respiratory protection equipment used in the hypoxic environment, underwater operation, escaping and fire-fighting hotspot. 2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB/T 2428-1998 Head-face dimensions of adults
GB 2626-2006 Respiratory protective equipment - Non-powered air-purifying particle respirator
GB/T 5703-1999 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 14866-2006 The specifications for personal eye-protectors
3.6
Inhalation valve
It refers to the one-way valve that only permits the inhalation air entering the mask but prevents the exhalation air being exhausted from the mask through it.
3.7
Exhalation valve
It refers to the one-way valve that only permits the exhalation air being exhausted from the mask but prevents the inhalation air entering the mask through it. 3.8
Inward leakage of mask
It refers to the ratio of simulant concentration leaked into the mask to the simulant concentration in the inhalation air where the examinee inhales under specified conditions.
3.9
Dead space
The volume of air re-inhaled from the previous exhalation
Note: it shall be expressed by the volume fraction of carbon dioxide in the inhalation air.
3.10
Breathing hose
It refers to the air-tightness hose used for connecting mask and filter. 4 Classification and Designation
4.1 Non-powered air-purifying respirator
Non-powered air-purifying respirators may be divided into chest style respirator and chin style respirator according to the connecting modes of mask and filter. 4.2 Mask
Masks may be divided into full mask and half mask according to the structure. 5.1.1.6 Anti-corrosion treatment shall be carried out for the metal material surfaces of mask.
5.1.2 High-low temperature adaptability
Masks pre-treated according to Section 6.3 shall be free from obvious deformation; threaded connection parts shall be able to well connect with the filter. 5.1.3 Fire resistance
Test shall be carried out according to the requirements of Section 6.4; after-flame time shall not be greater than 5s.
5.1.4 Exhalation valve of mask
5.1.4.1 Exhalation valves shall be provided with exhalation valve covers which can protect them from being damaged; exhalation valves shall have favorable action performance.
5.1.4.2 Test shall be carried out according to the requirements of Section 6.5; test results shall meet:
a) Where the exhalation valves are reduced pressure to -1180 Pa, the negative pressure value of full mask exhalation valve shall not decrease more than 500 Pa within 45s;
b) Where the exhalation valves are reduced pressure to -1180 Pa, the time required by half mask exhalation valve to recover to the normal pressure shall not be less than 20s.
5.1.5 Inward leakage of mask
Test shall be carried out according to the requirements of Section 6.6; test results shall meet:
a) Inward leakage of full mask shall not be greater than 0.05%;
b) Inward leakage of half mask shall not be greater than 2%.
5.1.6 Dead space of mask
Test shall be carried out according to the requirements of Section 6.7; test results shall not be greater than 1%.
5.1.7 View
Test shall be carried out according to the requirements of Section 6.8; test results shall be in accordance with those specified in Table 1.
6 Test Method for mask
6.1 Test sample
Test samples shall meet the description of product marks and have effective functions; the total quantity of test samples shall be determined according to the specific requirements of test, which is detailed in Appendix C.
6.2 Appearance inspection
Before the laboratory performance test, visual appearance inspection shall be carried out for the samples, and the samples shall meet the requirements of Article 5.1.1.
6.3 Pretreatment
6.3.1 Equipment
a) Technical performance of high temperature test chamber shall meet the requirements of GB/T 11158-2008;
b) Technical performance of low temperature test chamber shall meet the requirements of GB/T 10589-2008;
c) Technical performance of damp heat test chamber shall meet the
requirements of GB/T 10586-2006.
6.3.2 Method
Take the samples out of the original package and carry out the following conditional treatment in turn:
a) Place them in the (70±3)℃ high temperature test chamber with 20% relative humidity for (72±3)h;
b) Place them in the (70±3)℃ damp heat test chamber with (95~100)% relative humidity for (72±3)h;
c) Place them in the (-30±3)℃ low temperature test chamber for (24±1)h. Before each procedure, the subsequent test shall be carried out at least 4h after the samples recover to the room temperature.
Note: pretreatment shall be carried out under the condition that the samples do not suffer thermal shock.
6.5.2.1 Constant volume cavity: volume (150±10)mL.
6.5.2.2 Gas flowmeter: measuring range is (0~800)mL/min, precision is grade-1. 6.5.2.3 Micromanometer: measuring range is (0~2000)Pa, precision is 1 Pa. 6.5.2.4 Stopwatch: precision is 0.1s.
6.5.3 Test conditions
6.5.3.1 Normal temperature and pressure, the relative humidity shall be less than 75%.
6.5.3.2 Exhalation valve and constant volume shall be airtight, and vertical to the horizontal plane; valve plates shall not deform due to load carrying; exhalation valve shall be clean and dry.
6.5.4 Test procedure
6.5.4.1 Seal the ventilation holes of constant volume cavity and exhalation valve, extract air to -180Pa, close the air extraction control valve, and then observe. Pressure change shall not be observed within 2min.
6.5.4.2 Install the exhalation valve on the constant volume cavity, extract air from constant volume cavity at the flow rate not greater than 500 mL/min until the pressure in the cavity is -1250 Pa, and close the control valve.
6.5.4.3 Start timing when the system is -1180 Pa.
6.5.5 Test results
6.5.5.1 Negative pressure variation value at 45s shall be recorded for the full mask. 6.5.5.2 Time required by half mask to recover to 0 Pa shall be recorded. 6.5.5.3 Test results shall meet the requirements of clause 5.1.4; if one of the four samples is unqualified, the test shall be deemed as unqualified.
6.6 Inward leakage test of mask-oil-mist method
6.6.1 Sample quantity
Four samples; two of them are untreated samples, the other two are pre-treated samples.
Masks shall be correctly assembled with the filters or breathing hoses provided by manufacturers.
6.6.2 Test device
6.6.3.1 For each mask, 10 persons with corresponding head and facial dimensions shall be selected for the wearing test according to the adaptive range, and the examinees must shave off the beard. Mask wearing shall make the examinees feel suitable; head bands shall not be regulated too tight or too loose. Face length and surface width data of examinees shall be measured and recorded according to the requirements of GB/T 5703-1999.
6.6.3.2 Oil-mist concentration of test-cabin shall be within the range of (150~200)mg/m3.
6.6.3.3 Filter efficiency of filter to oil-mist shall be greater than 99.995%. If the manufacturer do not have the filter of such oil-mist filter efficiency, it may be replaced by the filter whose filter efficiency is greater than 99.995% in the test process, but the replacing filter shall be able to be well assembled with the mask.
6.6.3.4 Sampling tubes of test-cabin shall be placed in the head activity areas of the examinees. Sampling tubes shall be installed on the tested samples, the interfaces shall maintain airtight and the tube ends shall be close to the mouth and nose.
6.6.4 Test procedure
6.6.4.1 Fill the oil-mist into the test-cabin, regulate the concentration to the required concentration of test, and make the concentration stable, start air extracting pump, measure the gas flow concentration by photometer, namely, C0.
6.6.4.2 Examinees correctly wear the masks, carry out preliminary airtight inspection according to the use methods, adjust appropriate, and connect the sampling tube to the photometer.
6.6.4.3 Start air extracting pump, measure the gas flow concentration in the mask where the examinees respire in the smog free air outside of the test-cabin, take five values, and calculate mean of the five values as the background concentration Ce. 6.6.4.4 Sent the examinees into the test-cabin and make them complete the following actions upon the commands, measure the gas flow concentration in the cover under each action, take five values of each action, and calculate mean of the five values as the leakage concentration C of the action.
a) At least 1min at calm state;
b) At least 1min when moving heads;
c) Speaking about 1min.
6.6.5 Test results
6.7.2.5 Total dead space of test device gas circuit (excluding respirator) shall not be greater than 2000mL.
6.7.2.6 Electric fan: electric fan shall blow on the side of the tested sample, and make the gas flow at 0.5m/s in front of the mask.
6.7.3 Test procedure
6.7.3.1 Masks shall be correctly worn to the tested head-forms, which shall be airtight and free from deformation. If necessary, the mask perimeter and tested head-form shall be sealed with PVC strip or other appropriate sealant.
6.7.3.2 Respirator shall be adjusted to respiratory frequency 25 times/min and respiration tidal volume 2L/times.
6.7.3.3 CO2 shall be sent into the respirator by a flowmeter, compensation bag and one-way valve. CO2 absorber shall be used on the inspiration circuit between electromagnetic valve and respirator in order to prevent CO2 aggregation. 6.7.3.4 CO2 content in the inhalation gas shall be continuously measured and recorded until the CO2 concentration is stable.
6.7.3.5 CO2 concentration in the environment 1m away from the tested head-form nose shall be detected. Where the CO2 concentration in the inhalation gas achieves stable, measure the CO2 concentration in the environment immediately. CO2 concentration in the environment may also be measured from the sampling tube after the CO2 gas source is closed. Only when CO2 concentration in the environment is less than 0.1%, the test results may be regarded as valid.
6.7.4 Test results
6.7.4.1 CO2 concentration in the test environment is deducted from the measured value of CO2 content in the inhalation gas. Tested samples shall be tested three times. The mean value shall be regarded as the CO2 content in the inhalation gas. 6.7.4.2 Test results shall meet the requirements of Article 5.1.6; if one of the two samples is unqualified, the test shall be deemed as unqualified.
6.8 Visual field
6.8.1 Sample size
One untreated sample; masks shall be correctly assembled with filters or breathing hoses provided by manufacturers.
6.8.2 Test device
6.10.2.2 Manometer: measuring range is (0~2000)Pa; precision is 1Pa.
6.10.2.3 Manometry three-way pipe: internal diameter of pipe Φ (16±0.5) mm; length 100mm; opening of pressure transmission hole in air flow shall be no greater than Φ6mm.
6.10.2.4 Air compressor: ventilation volume shall be not less than 250L/min. 6.10.3 Test procedure
6.10.3.1 Regulate ventilation volume to (30±0.6)L/min and measure systemic resistance P1.
6.10.3.2 Install exhalant valve the test system, regulate ventilation volume (30±0.6)L/min and record measured resistance P2.
6.10.4 Test result
Exhalant valve resistance shall be calculated according to Formula (7): P=P2 - P1 ………..………………………………………….. (7)
P -- Inhalant valve resistance of the mask, in Pa;
P1 -- Inhalant valve resistance of the system, in Pa;
P2 -- Inhalant valve resistances of the mask and system, in Pa.
Test result shall meet those specified in 5.1.8; if one of three samples is unqualified, the test shall be unqualified.
6.11 Lens light transmittance test
6.11.1 Sample size
Two samples; one of them is untreated sample, the other one is pre-processed sample.
6.11.2 Test procedure
The test shall be carried out according to those specified in GB 14866-2006. 6.11.3 Test result
Test result shall meet those specified in 5.1.9.1; if one of two masks is unqualified, the test shall be considered unqualified.
6.12 Bonding strength test for masks and filters
Test result shall meet those specified in 5.1.12.2.
7 Filter test method
7.1 General provisions
In all the items of tests, if the test samples entirely meet the requirements, this item of test shall be considered qualified.
7.2 Test Samples
Test samples shall meet the description of product marks and have effective functions; the total quantity of test samples shall be determined according to the specific requirements of test, which is detailed in Appendix C.
7.3 Appearance inspection
Before performance test in laboratory, visual inspection shall be carried out on the samples, and the samples shall meet the requirements of Article 5.2.1.
7.4 Pre-processing
7.4.1 Sample size and requirements
4 untreated samples; samples shall be their minimum packaging condition. 7.4.2 Temperature pre-processing
7.4.2.1 Equipment
a) Technical performance of high temperature test chamber shall meet the requirements in GB/T 11158-2008;
b) Technical performance of low temperature test chamber shall meet the requirements in GB/T 10589-2008.
7.4.2.2 Method
Take the samples out of the original package and carry out the following conditional treatment in sequence:
a) Place it in dry high temperature test chamber of (70±3) ℃ for (24±1) h and relative humidity less than 20%;
b) Place it in low temperature test chamber of (-30±3) for (24±1) h.
Next test shall be carried out after the sample temperature is returned to ambient 7.5.2.2 Gas flow-meter: measuring range is (0~100)L/min, precision is grade-1. 7.5.3 Test condition
7.5.3.1 Temperature: (16~32)℃.
7.5.3.2 Relative humidity: (30~60)%.
7.5.3.3 Test flow: (30±0.6)L/min, (95±4)L/min; if two and more fillers are assembled at the same time on one filtering type respirator, the gas flow through each filter shall be divided equally on the basis of total flow.
7.5.4 Test procedure
7.5.4.1 Regulate the airflow to specialized range.
7.5.4.2 Determine the resistance P1 of test device itself.
7.5.4.3 Install the filter to the supporter and make the total resistance P2 (to 1 Pa) of its air tightness, determination sample and test device.
7.5.5 Test result
Filter ventilation resistance shall be calculated according to Formula (8): P=P2 - P1 ………………………………………… (8)
Where,
P -- Filter ventilation resistance, in Pa;
P2 -- Total resistance of the filter and test device, in Pa;
P1 -- Test device resistance, in Pa.
Test result shall meet those specified in 5.2.3.
7.6 Filter dust emission test
7.6.1 Sample size
4 samples, two of them are untreated samples and the other two are those through temperature and mechanical strength pre-processing.
7.6.2 Test device
Schematic diagram of test device is detailed in Figure 10.
7.7.3 Test condition
7.7.3.1 Air pressure: (0~20)kPa; precision is grade-1.
7.7.3.2 Test time: 1min.
7.7.3.3 Water temperature is not greater than 30℃.
7.7.4 Test procedure
Open the lamp in water tank, fill water into the water tank, and water surface shall immerse the filter; the filter top shall be 2cm from the water surface. Clamp the tested filter into special fixture, clamp the filter closely; open air switch and adjust pressure to make the air pressure entering the filter to be (15±2) kPa; immerse the clamp with the filter into the water tank for 1min; rotate and incline the filter and observe whether there is bubble running away.
7.7.5 Test result
Test result shall meet those specified in 5.2.5.
Note: this item is only applicable to filters of tank type.
7.8 Filter strength test
7.8.1 Sample size
4 samples, two of them are untreated samples and the other two are those through temperature and mechanical strength pre-processing in sequence.
7.8.2 Test procedure
7.8.2.1 Place the sample vertically free falling from height of (1 000±5)mm on the Korean pine wood board with thickness of (50±2)mm.
7.8.2.2 Carry out air-tightness test on the sample according to those specified in 7.7.4.
7.8.3 Test result
Test result shall meet those specified in 5.2.6.
Note: this item is only applicable to filters of tank type.
7.9 Filter smoke filtering performance test
7.9.1 Sample size
(30±0.5)L/min; determine the heat-rejection luminous intensity of its tail-gas oil-mist. 7.9.5 Test result
Smoke filtering performance of filters shall be calculated according to Formula (9): 100100
2 
IK 
 ………………………………………….. (9)
Where,
K′ -- Smoke filtering efficiency, %;
ρ2 -- Oil-mist concentration of tail gas, in mg/m3;
ρ1 -- Initial concentration of oil-mist, in mg/m3;
I2 -- Heat-rejection luminous intensity when oil-mist concentration is ρ2; I1 -- Heat-rejection luminous intensity when oil-mist concentration is ρ1; When scattering coefficient of instrument itself is Ke, smoke filtering efficiency of samples shall be calculated according to Formula (10):
K=K′ - Ke ……………………………………….. (10)
Where,
K -- Filter smoke filtering efficiency, %;
K′ -- Smoke filtering efficiency, %;
Ke -- Instrument smoke filtering efficiency, %....

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