Self-inhalation filter type dust mask general technical condition standard

Standard number: GB/T2626-1992 Replacement standard number: $False$

Issuing unit: National Technical Supervision Bureau Drafting unit: Ministry of Metallurgical Industry Safety and Environmental Protection Research Institute Theme content and scope of application This standard specifies the terms, classification, technical requirements, and test methods for self-absorption filter type dust respirator (hereinafter referred to as dust mask). Inspection rules, signs, packaging, transportation, storage and use.

This standard applies to all kinds of dust masks produced, sold and used.

This standard does not apply to respirators with less than 18% oxygen in the environment and noxious gases.

2 Quoting standard GB 2428 China adult head series GB 2828 batch inspection sampling sampling procedures and sampling tables (applicable to continuous batch inspection)

GB 2829 Periodic Inspection Count Sampling Procedures and Sampling Tables (Applicable to Inspection of Production Process Stability)

GB 5748 Determination of dust in workplace air GB/T 12903 Personal protective equipment terminology 3 Terminology 3.1 Self-inhalation filter type dust respirator self-inhalation filtertype dust respirator

Relying on the wearer's breathing to overcome the resistance of the parts, it is used as a dust-proof filter-type breathing apparatus.

3.2 Simple dust mask

Inhalation and exhalation are filtered through a self-priming filter dust mask.

3.3 Duplex dust mask complex dust mask

Equipped with self-absorption filter type dust respirator with filter box and breathing valve, suction and exhalation.

3.4 dust suppression efficiency dust collection efficiency

Under certain dust concentration and airflow conditions, wear dust masks and do not wear dust masks, the ratio of the difference between the two dust filter weight gain value and the filter weight value when not wearing a dust mask, with the percentage "% ".

3.5 Inhalation resistance

The dust mask is worn on the simulated head and draws pressure drops through the mask at a certain amount of air flow. Expressed in Pa (mmH2O).

3.6 exhalation resistance

The pressure drop that the dust mask wears when it is blown through a mask with a certain amount of air flow, and is expressed in Pa (mmH2O).

3.7 simulation head type dummy head

In order to carry out performance tests for dust-proof masks such as dust-blocking efficiency, breathing resistance, dead space, and visual field, the dimensions conform to the test head type specified in GB 2428 7.

3.8 visual field

When wearing a mask, the head is fixed and the scope of the eyes can be seen on the perimetry, in degrees.

3.9 mask dead space of the mask

Dust mask worn on the simulated head, the space formed between the mask and the face, in milliliters.

4 dust mask classification 4.1 Duplex dust mask.

4.2 Simple dust mask.

5 Technical Requirements 5.1 The materials used shall be free of abnormal odors, non-allergic, and non-irritating.

5.2 Filter dust material See Appendix A (Supplement).

5.3 mask performance, should meet the requirements of Table 1.

6 mask performance test 6.1 equipment 6.1.1 simulated head conforms to the requirements of GB 2428 7.

6.1.2 Gas meter accuracy ± 2.5%, greater than 30L/min.

6.1.3 The accuracy of the micromanometer is 1.96 Pa (mmH2O) and the range is not less than 294 Pa (30mmH2O).

6.1.4 Analytical balance Sensitivity is not less than 0.0001g.

6.1.5 dust emission device (Figure 1)

a. The effective volume is not less than 0.8m3;

b. Concentration control 40 ± 10mg/m3.

6.1.6 Test dust medical talcum powder, suspended particle size less than 5μm accounted for more than 90%, less than 2μm accounted for more than 70%.

6.1.7 dust sampling sampler should meet the requirements of GB 5748 Appendix A A2.

6.1.8 dust filter membrane should meet the requirements of 3.2.2 of GB 5748, with a diameter of 40mm perchlorethylene fiber membrane.

6.1.9 Exhalation valve air tightness test device a. Gas flowmeter 0 ~ 1 000mL;

b. Water column pressure gauge 0~1 960 Pa (200mmH2O);

c. The maximum pumping volume of suction pump is 1.5L/min.

6.2 Dust blocking efficiency Put the mask on the analog head and follow the procedure below:

a. Measure the dust filter and weigh it into the dust sampling clamp, and put it into the sampling ring in the analog head type and tighten it.

b. Place the masked model with the mask into the cabinet, and connect the tube between the sampling hole and the dust sampler (Figure 1).

1 - Cleaner cabinets; 2 - Controlled sampling; 3 - Analog head type; 4 - Flowmeter; 5 - Vacuum pump c. After the ready-to-measure dust filter is clamped, place it on a sampling ring in an analog head type that does not wear a mask, put it into the dust box, and connect the tube between the sampling hole and the dust sampler. Then, Close the door.

d. Start the switch and let the air with dust of 40±10mg/m3 pass through the nostrils of two simulated heads at a flow rate of 30L/min. After 10min, remove the dust filter membranes after the two analog heads and weigh them on the analytical balance. Calculate the dust blocking efficiency of the mask according to equation (1).

In the formula: A - wearing a mask to simulate the first dust filter dust filter weight gain, mg;

B - Do not wear a mask to simulate the first type dust filter dust weight, mg;

η - dust blocking efficiency,%.

6.3 Inspiratory resistance Put the mask on the analog head type, connect the micro pressure gauge, flow meter and suction pump according to Figure 2 and pump at a flow rate of 30 L/min to observe the pressure difference between wearing a mask and not wearing a mask. That is, the suction resistance value.

1 - Analog head type; 2 - Measured masks; 3 - Three links; 4 - Micro pressure gauges; 5 - Gas flow meters; 6 - Flow adjustment screw clamps; 7 - Buffer bottles 6.4 Exhalation resistance according to 6.3 method, With a flow rate of 30 L/min, the pressure difference between wearing a mask and not wearing a mask was observed as the value of the expiratory resistance.

6.5 Suction resistance rise value Measure the suction resistance value of the outlet cover according to 6.3, and then follow the instructions in 6.2, in the dust-containing 40±10mg/m3 cabinet. Pass the mask at a flow rate of 30 L/min, remove the mask after 90 minutes, and measure the resistance of the outlet cover according to 6.2.3, which is the increase in suction resistance.

6.6 Moisture resistance rise value Measure the value of the suction resistance of the outlet cover according to 6.3, then put the simulated head shape of the mask into a cabinet with a relative humidity of more than 95% and pump it at a flow rate of 30L/min. The water vapor passes through the mask, and after 10 minutes, the resistance of the mask is measured according to 6.3, which is the increase of the moisture resistance.

6.7 dead cavity will wear a mask on the simulated head type (with valve mask need to close the breathing valve hole), so that the head type face down, through the head after the hole in the mask slowly into the water, after the fill Pour the water in the outlet hood and measure the volume of water in the measuring cylinder, which is the dead volume (mL).

6.8 Visual field selection A visual acuity of not less than 1.0 The normal person uses an arched medical perimeter meter to measure the lower viewing angle when wearing a mask, which is the lower field of view (degrees) of the mask.

6.9 Exhalation valve airtightness When the exhalation valve is installed on the valve seat of the airtight tester, the suction is stopped at a flow rate of not more than 500 mL/min to a negative pressure of 980 Pa (100 mmH2O), and the stopwatch is started. Record the time required for the pressure gauge water column to return to normal pressure.

7 Inspection rules 7.1 Inspection classification 7.1.1 The factory inspection shall be conducted by the quality inspection department of the manufacturer according to the normal inspection one-time sampling plan specified in GB 2828.

7.1.1.1 Inspection items are:

a. Dust blocking efficiency;

b. Suction resistance;

c. Exhalation resistance (No valve masks do not do this);

d. Exhalation valve hermeticity (no valve mask does not do this).

Inspection level: Special inspection level S-2, qualified quality level AQL=6.5.

7.1.1.2 Check the batch size and sample size, dust mask, every 1 ~ 2d as a check batch, the maximum inspection batch does not exceed 10 000, according to the provisions of Table 2 of GB 2828 randomly selected.

7.1.2 The type inspection shall be carried out in one of the following situations:

a. The test-type identification of the new product or old product to the factory;

b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance;

c. Regular inspections should be conducted once a year for normal production;

d. When the production ceases production for more than 6 months, the production will resume;

e. When there is a big difference between the inspection result of the factory product and the type inspection of the preceding item;

f. When the State Quality Supervision Agency proposes a type inspection.

7.1.2.1 Test items, unqualified classifications, discrimination levels, and unqualified quality level values ​​(RQL) are specified in Table 2. The product quality inspection department designated by the country shall carry out a sampling plan as specified in GB 2829.

Note: 1) Resistance refers to inhalation resistance, expiratory resistance, increase in inspiratory resistance, and moisture resistance. Duplicate dust masks only do the first three items, simple dust masks do not exhale resistance, other items are done.

7.1.2.2 After the inspection process a. The results of the periodical inspections conducted annually by the enterprise are the basis for batch inspections.

b. If the periodical inspection fails, the competent quality department shall investigate the cause of the nonconformity carefully. If the cause of the nonconformity can be corrected immediately, the periodic inspection of the product manufactured after correction shall be allowed; if the product that fails the periodic inspection is rejected through the screening method Or it can be repaired to allow periodic inspection of the product after screening or repair.

c. The reasons for the failure of periodic inspections cannot be corrected immediately, and enterprises should temporarily suspend the normal mass production of representative products during this cycle inspection. Only under the supervision of the superior competent quality department, the products manufactured after corrective measures are adopted shall be returned to normal batch production and batch-by-batch inspection after passing the cycle inspection.

d. Within the stipulated time, the company failed to take effective corrective measures to make the product cycle check passable, and the National Labor Protection Product Production License Office took back the company's production license. After the enterprise has taken effective corrective measures, it may re-apply for a production license to the issuing authority and go through the simplified procedure.

8 signs, packaging, transportation and storage 8.1 product signs, should be placed in the upper or lower part of the front of the mask body, the basic content of the product mark includes:

a. Manufacturer name

b. product name;

c. trademark;

d. Product model or mark;

e. Industrial production license number;

f. Production lot number or production date;

g. Safety certification.

Which a, d, e, g must have.

8.2 Packaging 8.2.1 Products should be classified according to masks, respectively, using boxes, boxes and plastic bags.

8.2.2 Product Packing Information:

a. Product certification;

b. Product Manual;

c. Packing List;

d. Other relevant technical information.

8.3 Storage 8.3.1 Storage sites, product inventory must not be placed together with acid and alkali and other toxic substances. Ventilation, drying and temperature should be kept at 0~35°C.

8.3.2 The period of storage shall not exceed 2 years, and masks that exceed the 2 year duration shall be subject to re-examination by 2 samples. The inspection items are dust blocking efficiency, breathing resistance and valve airtightness, and can only be sold and used after obtaining the certification.

8.4 Transportation 8.4.1 Transport conditions, no matter what kind of transport tools, must be covered during the transportation of products, moisture, frost, and sunlight.

8.4.2 The precautions shall not be mixed and transported with acids, alkalis and other toxic substances to keep the product clean, sanitary and free of contamination.

9 Use 9.1 The environment is not suitable for environments containing less than 18% of smoke and oxygen.

9.2 Scope When selecting dust masks, the maximum allowable dust concentration and dust concentration in the environment should be used. Refer to Table 3 for selection of masks.

Appendix A

Dust mask filter (Supplement)

A1 Application scope This appendix applies to the filter material of dust masks.

A2 technical requirements A2.1 material shall not have irritating and allergic adverse effects on human skin.

A2.2 dust blocking efficiency Superfine fiber filter is greater than 95%, other filter material is greater than 90%.

A2.3 The initial resistance is less than 40 Pa (5mmH2O).

A2.4 The increase in wet resistance is less than 147 Pa (15 mmH2O).

A3 test method A3.1 The sample filter material is not less than 1m2, from the surrounding and the center to take a total of 5 diameter φ100mm sample.

A3.2 dust blocking efficiency Take the sample into the filter inspection fixture (Figure A1), and then proceed according to the provisions of 6.2 of this standard.

1 - Specimen fixed cover; 2 - Specimen; 3 - Dust sampler A3.3 Resistance value The initial resistance value and the wet resistance increase value of the sample preparation are the same as A3.2, followed by sampling the dust sampling sampler, and then According to the provisions of 6.3 and 6.6 of this standard.

The average value of the A4 qualification test specimen shall not be lower than that specified in A2.2, A2.3 and A2.4, otherwise it is a nonconforming product.

The establishment of self-absorption filter type dust respirator general technical condition standards is very important, this is very helpful for the development of dust masks, allows companies to produce very good products for consumers, companies can also be very good According to this standard to produce products, this is the best of both worlds. Enterprises must strictly invest in production according to this standard, so long as they meet the above requirements, they have a very strong market in the consumer market. Only companies that do their best can go longer.