GB/T 2626-1992 General technical requirements for self-priming filter dust masks
Some standard content:
National Standard of the People's Republic of China
General technical requirements for self-inhalation filtertype dust respirator1 Subject content and scope of application
GB/T 2626-92
Replaces GB2626-81
This standard specifies the terminology, classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and use of self-inhalation filtertype dust respirators (hereinafter referred to as dust respirators). This standard applies to all types of dust masks produced, sold and used. This standard does not apply to respirators used in environments with oxygen below 18% and toxic gases. 2 Reference standards
GB2428 Chinese adult head shape series
GB2828 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB2829 Periodic inspection counting sampling procedure and sampling table (applicable to the inspection of production process stability) GB5748 Method for determination of dust in workplace air GB/T12903 Terminology of personal labor protection products 3 Terminology
3.1 Self-inhalation filter type dust respirator Self-inhalation filter type dust respirator A filter type respirator used for dust prevention that relies on the wearer's breathing to overcome the resistance of the components. 3.2 Simple dust mask Simple dust mask A self-inhalation filter type dust respirator in which both inhalation and exhalation pass through the filter material. 3.3 Complex dust mask Complex dust mask A self-inhalation filter type dust respirator equipped with a dust filter box and a breathing valve, with separate inhalation and exhalation. 3.4 Dust collection efficiency Under certain dust concentration and airflow conditions, the difference between the weight gain of the dust filter membrane when wearing a dust mask and when not wearing a dust mask and the weight gain of the filter membrane when not wearing a dust mask, expressed as a percentage "%. 3.5 Inhalation resistance inhalation resistance The pressure drop caused by a certain air flow through the mask when the dust mask is worn on a simulated head shape. Expressed in Pa (mmH, O).
3.6 Exhalation resistance
Exhalation resistance
The pressure drop caused by a certain air flow through the mask when the dust mask is worn on a simulated head shape, expressed in Pa (mmH, O).
3.7 Dummy head
To test the dust blocking efficiency, breathing resistance, dead space, visual field and other performance of dust masks, the size conforms to the test head shape specified in GB24287, approved by the State Administration of Technical Supervision on September 2, 1992 and implemented on March 1, 1993.
visual field
GB/T 2626--92
When wearing a mask, the head is fixed and the range that both eyes can see on the visual field meter, unit: degree. Dead space of the mask3.9
The space formed between the mask and the face when the dust mask is worn on the dummy head shape, unit: milliliter. 4 Classification of dust masks
Duplex dust masks.
4.2 Simple dust masks.
5 Technical requirements
5.1 The materials used should have no abnormal odor, no allergy, and no irritation to people. 5.2 See Appendix A (Supplement) for dust filter materials. 5.3 Mask performance should meet the requirements of Table 1. Table 1
Item name
Dust blocking efficiency, %
Resistance, Pa (mmH, O)
Mass, g
Dead space, mL
Air tightness of exhalation valve, s
Inhalation resistance rise value
Pa (mmH20)
Wet resistance value
Pa (mmH.0)
Field of view (below), (°)
Mask performance test
6.1 Equipment
The simulated head shape meets the requirements of GB24287.
Compound dust mask
≤49（5)
≤29.4(3)
《117.6(12)
6.1.2 Gas flow meter accuracy ±2.5%, greater than 30L/min. Refers to
6.1.3 Micromanometer accuracy 1.96Pa(0.2mmH,0), range not less than 294Pa（30mmH0）. 6.1.4 Analytical balance sensitivity not less than 0.0001g. 6.1.5 Dust generating device (Figure 1)
Effective volume not less than 0.8m;
~Concentration control 40±10mg/m2.
Simple dust mask
≤39.2(4)
≤29.4(3)(with valve)
≤98(10)
≤147(15)
Test dust: medical talcum powder, with suspended particle size less than 5um accounting for more than 90%, and less than 2μm accounting for more than 70%. 6.1.6
Dust sampler shall comply with the requirements of Appendix AA2 of GB5748. Dust filter membrane shall comply with the requirements of 3.2.2 of GB5748, and use perchlorethylene fiber filter membrane with a diameter of 40mm. 6.1.9 Exhalation valve air tightness test device
Gas flow meter 0～1000mL;
GB/T 2626-92
Water column pressure gauge 0～1960Pa (200mmH,0); Maximum air suction volume of the vacuum pump 1.5L/min.
6.2 Dust blocking efficiency Install the mask on the simulated head form, and then follow the following procedures: a.
Weigh the dust filter membrane and place it in the dust sampling clamp, install it into the sampling ring in the simulated head form, and tighten it. Put the simulated head form wearing the mask into the dust cabinet, and connect the leather hose between the sampling hole and the dust sampler (Figure 1). Figure 1 Schematic diagram of dust blocking efficiency measurement device
1—Dust cabinet: 2—Control sampling; 3—Simulated head shape; 4—Flowmeter; 5—Vacuum pump After clamping the prepared dust filter membrane, put it into the sampling ring in a simulated head shape without wearing a mask, put it into the dust cabinet, connect the leather hose between the sampling hole and the dust sampler, and then close the cabinet door. d. Start the switch, at a flow rate of 30L/min, let the air containing 40±10mg/m2 of dust pass through the nostrils of the two simulated head shapes, after 10 minutes, remove the dust filter membrane behind the two simulated head shapes, weigh it on the analytical balance, and calculate the dust blocking efficiency of the mask according to formula (1). BA
Where: A—Dust weight gain of the dust filter membrane of the simulated head shape wearing a mask, mg, B—Dust weight gain of the dust filter membrane of the simulated head shape without wearing a mask, mg; n—Dust blocking efficiency, %.
6.3 Inhalation resistance Install the mask on the simulated head model, connect the micromanometer, flowmeter and vacuum pump according to Figure 2, and exhaust at a flow rate of 30L/min. Observe the pressure difference when wearing a mask and not wearing a mask, which is the inhalation resistance value. 91
GB/T 2626
Figure 2 Schematic diagram of the breathing resistance test device
1-simulated head model; 2-tested mask; 3-three-way; 4-micromanometer; 5-gas flowmeter; 6-flow regulating screw clamp; 7-buffer bottle oil and gas pump
6.4 Exhalation resistance According to the method in 6.3, backflush at a flow rate of 30L/min, observe the pressure difference when wearing a mask and not wearing a mask, which is the exhalation resistance value.
6.5 Inhalation resistance rise value According to the provisions of 6.3, measure the inhalation resistance value of the mask, and then according to the provisions of 6.2, in a cabinet with a dust content of 40±10mg/m2. Pass the mask at a flow rate of 30L/min, remove the mask after 90 minutes, and then measure the resistance of the mask according to the provisions of 6.2.3, which is the increase in inhalation resistance.
6.6 Increase in moisture resistance Measure the inhalation resistance of the mask according to the provisions of 6.3, and then place the simulated head model wearing the mask in a cabinet with a relative humidity greater than 95%, and exhaust at a flow rate of 30L/min to allow water vapor to pass through the mask. After 10 minutes, measure the resistance of the mask again according to the provisions of 6.3, which is the increase in moisture resistance.
6.7 Dead space Put the mask on the simulated head model (the breathing valve hole of the valve mask needs to be closed), with the head model facing downward, slowly inject water into the mouth through the opening behind the head model, pour out the water in the mask after it is filled, and use a measuring cylinder to measure the water capacity, which is the dead space volume (mlL). 6.8 Visual field Select a normal person with a visual acuity of not less than 1.0 Use an arc-shaped medical perimeter to measure the lower visual angle when wearing a mask, which is the lower visual field of the mask (degrees).
6.9 Air tightness of the exhalation valve Install the exhalation valve on the valve seat of the air tightness tester and evacuate the air at a flow rate of no more than 500mL/min to a negative pressure of 980Pa (100mmH,O), stop pumping, start the stopwatch, and record the time required for the water column on the pressure gauge to return to normal pressure. 7 Inspection rules
7.1 Inspection classification
7.1.1 The factory inspection is carried out by the quality inspection department of the manufacturer according to the normal inspection sampling plan specified in GB2828. 7.1.1.1 The inspection items are:
dust blocking efficiency;
inhalation resistance;
exhalation resistance (this item is not required for valveless masks); c.
d. Exhalation valve air tightness (this item is not required for valveless masks). Inspection level: special inspection level S-2, qualified quality level AQL=6.5. 7.1.1.2 Inspection batch and sample size, dust masks are inspected every 1~2 days, and the maximum inspection batch shall not exceed 10,000 pieces, which are randomly selected according to the provisions of Table 2 in GB2828.
7.1.2 Type inspection Type inspection shall be conducted in any of the following cases: a
Trial type identification of new products or old products transferred to the factory for production; b.
GB/T 2626-92
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; a periodic inspection shall be conducted once a year in normal production; when the product is stopped for more than 6 months and then resumed; when there is a major difference between the inspection results of the ex-factory products and the previous type inspection; when the national quality supervision agency proposes a requirement for type inspection. 7.1.2.1 Inspection items, non-conforming classification, discrimination level, and non-conforming quality level value (RQL) shall be carried out in accordance with Table 2. The product quality inspection department designated by the state shall conduct the inspection in accordance with the one-time sampling plan specified in GB2829. Table 2
Discrimination level
Inspection items
Dust blocking efficiency
Air tightness of exhalation valve
Unqualified
Discrimination array
Note: 1) Resistance refers to inhalation resistance, exhalation resistance, inhalation resistance rise value, and moisture resistance value. For compound dust masks, only the first three items are done, and for simple dust masks, exhalation resistance is not done, and all other items are done.
7. 1. 2. 2
Processing after inspection
The qualified results of the annual periodic inspection of the enterprise are the basis for batch inspection. If the periodic inspection of the enterprise fails, the competent quality department shall seriously investigate the reasons for the failure. If the reasons for the failure can be corrected immediately, the products manufactured after the correction are allowed to undergo periodic inspection; if the products that fail the periodic inspection can be eliminated or repaired by screening methods, the products that have been screened or repaired are allowed to undergo periodic inspection. c.
If the reasons for the failure of the periodic inspection cannot be corrected immediately, the enterprise shall temporarily stop the normal batch production of the products represented by the periodic inspection. Only under the supervision of the superior quality department, the products manufactured after taking corrective measures can resume normal batch production and batch inspection after passing the periodic inspection.
d. If the enterprise fails to take effective corrective measures to make the product pass the periodic inspection within the prescribed time, the National Labor Protection Product Production License Office will revoke the enterprise's production license. After the enterprise has taken effective corrective measures, it may reapply for a production license from the issuing department and go through the formalities according to simplified procedures.
Marking, packaging, transportation and storage
The product logo should be placed on the upper or lower part of the front of the mask body. The basic content of the product logo includes: 8.1
Manufacturer name;
Product name;
Trademark;
Product model or mark;
Industrial production license number;
Production batch number or production date;
Safety identification certificate.
Among them, a, d, e, and g must be available.
8.2 Packaging
8.2.1 Products should be packed in boxes, boxes, and plastic bags according to the classification of masks. 93
Documents accompanying product packaging:
Product certificate;
b. Product manual;
Packing list;
Other relevant technical information.
8.3 Storage
GB/T 2626—92
8.3.1 Storage place, product inventory shall not be placed together with acids, alkalis, and other toxic substances. Ventilation, dryness, and temperature should be maintained at 0-35℃. 8.3.2 Storage period, the longest shall not exceed 2 years. Masks with a storage period of more than 2 years shall be sampled and re-inspected at 2%. The inspection items are dust blocking efficiency, breathing resistance, and valve air tightness. They can only be sold and used after obtaining a certificate of conformity. 8.4 Transportation
8.4.1 Transportation conditions, no matter what kind of transportation means is used, the product must be covered, moisture-proof, antifreeze, and protected from sunlight during transportation. 8.4.2 Precautions, it must not be mixed with acids, alkalis and other toxic substances for transportation, and keep the product clean, sanitary and uncontaminated. 9 Use
9.1 Environment
9.2 Scope
Dust mask
Dust blocking efficiency, %
Not suitable for environments containing smoke and oxygen below 18%. When selecting dust masks, the maximum allowable dust concentration and the dust concentration of the environment should be considered. You can refer to Table 3 to select various types of masks. Table 3
Scope of application
Maximum allowable dust concentration, mg/m
Environmental dust concentration, mg/m3
A1 Scope of application
This appendix applies to the filter material of dust masks. A2 Technical requirements
GB/T 2626-- 92
Appendix A
Dust mask filter material
(Supplement)
A2.1 The material shall not cause irritation and allergic harmful effects on human skin. A2.2 The dust blocking efficiency of microfiber filter material is greater than 95%, and that of other filter materials is greater than 90%. A2.3 The initial resistance value is less than 49Pa (5mmH,O). A2.4 The wet resistance rise value is less than 147Pa (15mmH,0). A3 Test method
The sample filter material shall not be less than 1m2, and 5 samples with a diameter of 100mm shall be taken from all sides and the center. A3.1i
A3.2 Dust blocking efficiency Take the sample and put it into the filter material test fixture (Figure A1), and then proceed according to the provisions of 6.2 of this standard. Figure A1 Schematic diagram of filter material fixture
1--Sample fixing cover; 2-Sample; 3-Dust sampler A3.3 Resistance value The sample preparation for initial resistance value and wet resistance rise value is the same as A3.2, followed by sampling of dust sampler, and then proceed according to the provisions of 6.3 and 6.6 of this standard.
A4 Qualification judgment
The average value of the sample shall not be lower than the provisions of A2.2, A2.3 and A2.4, otherwise it is a non-conforming product. Additional remarks:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the Safety and Environmental Protection Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Yu Qiyuan, Zhou Xizhi, Yu Xiang, Yang Hui, and Wang Degong. 951. 2. 2
Post-inspection processing
The qualified results of the annual periodic inspection of the enterprise are the basis for batch inspection. If the enterprise fails the periodic inspection, the competent quality department shall carefully investigate the reasons for the failure. If the reasons for the failure can be corrected immediately, the products manufactured after the correction shall be allowed to undergo periodic inspection; if the products that fail the periodic inspection can be eliminated or repaired by screening, the products after screening or repair shall be allowed to undergo periodic inspection. c.
If the reasons for the failure of the periodic inspection cannot be corrected immediately, the enterprise shall temporarily stop the normal batch production of the products represented by the periodic inspection. Only under the supervision of the superior competent quality department, the products manufactured after taking corrective measures and passing the periodic inspection can resume normal batch production and batch inspection.
d. If the enterprise fails to take effective corrective measures to make the product pass the periodic inspection within the prescribed time, the National Labor Protection Product Production License Office will revoke the enterprise's production license. After the enterprise has taken effective corrective measures, it may reapply for a production license from the issuing department and go through the simplified procedures.
Marking, packaging, transportation and storage
The product logo should be placed on the upper or lower part of the front of the mask body. The basic content of the product logo includes: 8.1
Manufacturer name;
Product name;
Trademark;
Product model or mark;
Industrial production license number;
Production batch number or production date;
Safety identification certificate.
Among them, a, d, e and g must be available.
8.2 Packaging
8.2.1 Products should be packed in boxes, boxes and plastic bags according to the classification of masks. 93
Documents accompanying the product packaging:
Product certificate;
b. Product manual;
Packing list;
Other relevant technical information.
8.3 Storage
GB/T 2626—92
8.3.1 Storage place, product inventory shall not be placed together with acids, alkalis and other toxic substances. Ventilation, dryness, and temperature should be maintained at 0-35℃. 8.3.2 Storage period, the longest shall not exceed 2 years. Masks with a storage period of more than 2 years shall be sampled and re-inspected at 2%. The inspection items are dust blocking efficiency, breathing resistance and valve air tightness. They can only be sold and used after obtaining a certificate of conformity. 8.4 Transportation
8.4.1 Transportation conditions, no matter what means of transportation is used, the product must be covered, moisture-proof, frost-proof, and protected from sunlight during transportation. 8.4.2 Precautions, it shall not be mixed with acids, alkalis and other toxic substances for transportation, and the product shall be kept clean, hygienic and uncontaminated. 9 Use
9.1 Environment
9.2 Scope
Dust mask
Dust blocking efficiency, %
Not suitable for environments containing smoke and oxygen less than 18%. When selecting dust masks, the maximum allowable dust concentration and the dust concentration of the environment should be considered. You can refer to Table 3 to select various types of masks. Table 3
Scope of application
Maximum allowable dust concentration, mg/m
Environmental dust concentration, mg/m3
A1 Scope of application
This appendix applies to the filter material of dust masks. A2 Technical requirements
GB/T 2626-- 92
Appendix A
Dust mask filter material
(Supplement)
A2.1 The material shall not cause irritation and allergic harmful effects on human skin. A2.2 The dust blocking efficiency of ultrafine fiber filter material is greater than 95%, and that of other filter materials is greater than 90%. A2.3 The initial resistance value is less than 49Pa (5mmH,O). A2.4 The wet resistance rise value is less than 147Pa (15mmH,0). A3 Inspection method
The sample filter material is not less than 1m2, and 5 samples with a diameter of 100mm are taken from the four sides and the center. A3.1iwwW.bzxz.Net
A3.2 Dust blocking efficiency Take the sample and put it into the filter material inspection fixture (Figure A1), and then proceed according to the provisions of 6.2 of this standard. Figure A1 Schematic diagram of filter material fixture
1--Sample fixing cover; 2-Sample; 3-Dust sampler A3.3 Resistance value The sample preparation for the initial resistance value and the wet resistance rise value is the same as A3.2, and then the dust sampler is sampled, and then the provisions of 6.3 and 6.6 of this standard are respectively carried out.
A4 Qualification judgment
The average value of the sample shall not be lower than the requirements of A2.2, A2.3 and A2.4, otherwise it is a non-conforming product. Additional remarks:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the Safety and Environmental Protection Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Yu Qiyuan, Zhou Xizhi, Yu Xiang, Yang Hui and Wang Degong. 951. 2. 2
Post-inspection processing
The qualified results of the annual periodic inspection of the enterprise are the basis for batch inspection. If the enterprise fails the periodic inspection, the competent quality department shall carefully investigate the reasons for the failure. If the reasons for the failure can be corrected immediately, the products manufactured after the correction shall be allowed to undergo periodic inspection; if the products that fail the periodic inspection can be eliminated or repaired by screening, the products after screening or repair shall be allowed to undergo periodic inspection. c.
If the reasons for the failure of the periodic inspection cannot be corrected immediately, the enterprise shall temporarily stop the normal batch production of the products represented by the periodic inspection. Only under the supervision of the superior competent quality department, the products manufactured after taking corrective measures and passing the periodic inspection can resume normal batch production and batch inspection.
d. If the enterprise fails to take effective corrective measures to make the product pass the periodic inspection within the prescribed time, the National Labor Protection Product Production License Office will revoke the enterprise's production license. After the enterprise has taken effective corrective measures, it may reapply for a production license from the issuing department and go through the simplified procedures.
Marking, packaging, transportation and storage
The product logo should be placed on the upper or lower part of the front of the mask body. The basic content of the product logo includes: 8.1
Manufacturer name;
Product name;
Trademark;
Product model or mark;
Industrial production license number;
Production batch number or production date;
Safety identification certificate.
Among them, a, d, e and g must be available.
8.2 Packaging
8.2.1 Products should be packed in boxes, boxes and plastic bags according to the classification of masks. 93
Documents accompanying the product packaging:
Product certificate;
b. Product manual;
Packing list;
Other relevant technical information.
8.3 Storage
GB/T 2626—92
8.3.1 Storage place, product inventory shall not be placed together with acids, alkalis and other toxic substances. Ventilation, dryness, and temperature should be maintained at 0-35℃. 8.3.2 Storage period, the longest shall not exceed 2 years. Masks with a storage period of more than 2 years shall be sampled and re-inspected at 2%. The inspection items are dust blocking efficiency, breathing resistance and valve air tightness. They can only be sold and used after obtaining a certificate of conformity. 8.4 Transportation
8.4.1 Transportation conditions, no matter what means of transportation is used, the product must be covered, moisture-proof, frost-proof, and protected from sunlight during transportation. 8.4.2 Precautions, it shall not be mixed with acids, alkalis and other toxic substances for transportation, and the product shall be kept clean, hygienic and uncontaminated. 9 Use
9.1 Environment
9.2 Scope
Dust mask
Dust blocking efficiency, %
Not suitable for environments containing smoke and oxygen less than 18%. When selecting dust masks, the maximum allowable dust concentration and the dust concentration of the environment should be considered. You can refer to Table 3 to select various types of masks. Table 3
Scope of application
Maximum allowable dust concentration, mg/m
Environmental dust concentration, mg/m3
A1 Scope of application
This appendix applies to the filter material of dust masks. A2 Technical requirements
GB/T 2626-- 92
Appendix A
Dust mask filter material
(Supplement)
A2.1 The material shall not cause irritation and allergic harmful effects on human skin. A2.2 The dust blocking efficiency of ultrafine fiber filter material is greater than 95%, and that of other filter materials is greater than 90%. A2.3 The initial resistance value is less than 49Pa (5mmH,O). A2.4 The wet resistance rise value is less than 147Pa (15mmH,0). A3 Inspection method
The sample filter material is not less than 1m2, and 5 samples with a diameter of 100mm are taken from the four sides and the center. A3.1i
A3.2 Dust blocking efficiency Take the sample and put it into the filter material inspection fixture (Figure A1), and then proceed according to the provisions of 6.2 of this standard. Figure A1 Schematic diagram of filter material fixture
1--Sample fixing cover; 2-Sample; 3-Dust sampler A3.3 Resistance value The sample preparation for the initial resistance value and the wet resistance rise value is the same as A3.2, and then the dust sampler is sampled, and then the provisions of 6.3 and 6.6 of this standard are respectively carried out.
A4 Qualification judgment
The average value of the sample shall not be lower than the requirements of A2.2, A2.3 and A2.4, otherwise it is a non-conforming product. Additional remarks:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the Safety and Environmental Protection Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Yu Qiyuan, Zhou Xizhi, Yu Xiang, Yang Hui and Wang Degong. 952. Figure A1 Schematic diagram of filter material fixture
1--Sample fixing cover; 2-Sample; 3-Dust sampler A3.3 Resistance value The sample preparation for initial resistance value and wet resistance rise value is the same as A3.2, followed by sampling of dust sampler, and then proceed according to the provisions of 6.3 and 6.6 of this standard.
A4 Qualification judgment
The average value of the sample shall not be lower than the provisions of A2.2, A2.3 and A2.4, otherwise it is a non-conforming product. Additional remarks:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the Safety and Environmental Protection Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Yu Qiyuan, Zhou Xizhi, Yu Xiang, Yang Hui, and Wang Degong. 952. Figure A1 Schematic diagram of filter material fixture
1--Sample fixing cover; 2-Sample; 3-Dust sampler A3.3 Resistance value The sample preparation for initial resistance value and wet resistance rise value is the same as A3.2, followed by sampling of dust sampler, and then proceed according to the provisions of 6.3 and 6.6 of this standard.
A4 Qualification judgment
The average value of the sample shall not be lower than the provisions of A2.2, A2.3 and A2.4, otherwise it is a non-conforming product. Additional remarks:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the Safety and Environmental Protection Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Yu Qiyuan, Zhou Xizhi, Yu Xiang, Yang Hui, and Wang Degong. 95
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