Operating procedures for mask filtration efficiency test instrument

Repeated epidemics have greatly affected people’s lives. Masks have become an indispensable means of protection for everyone. However, the production requirements of masks are very strict. During the production process, manufacturers will select professional mask filtration efficiency test instrument for filtration testing to ensure the quality of masks.

When we select masks, we will see similar words on the package with “filter efficiency of at least 95%”, but different mask types will be marked with BFE or PFE before the filter efficiency. What do these two indicators represent respectively?

What is the BFE (bacterial filtration efficiency)?
BFE (bacterial filtration efficiency) refers to the barrier effect of the mask material on the bacteria produced by the wearer. It is mainly used for medical surgical masks [1] and disposable medical masks [2]. Such products may be marked with BFE on the package.

What is the PFE (particulate filter efficiency) indicator?
Those respirators used to filter suspended particles in the air (such as bacteria, viruses, dust, welding smoke, etc.) and reduce people’s inhalation of these pathogenic or harmful particles from the respiratory tract have particle filtration efficiency indicators, such as the anti particle respirator conforming to the Chinese standard gb2626 [4]. However, the filtering effect of the particulate matter protective mask on airborne particulate matter can only be achieved by the unique sealing structure design of the protective mask, because the suspended particles in the air are extremely small and invisible to the naked eye, and they will flow with the air at will. If the mask is not designed to be in close contact with the wearer’s face, Particles will easily leak into the mask from any leakage gap on the mask with the air flow. Therefore, when discussing the particulate matter filtration efficiency of the respirator, there should be a requirement for the tightness of the respirator.

Therefore, as a manufacturer and the main user of the mask filter test instrument, it is necessary to understand its operating procedures.

When using the mask filter efficiency test instrument, first make preparations before startup:
1. Check the connection between the air source of the air compressor and the test hose.
2. Turn on the test power. Turn on the main power switch of the tester, press the “heating” button, the heating temperature is 120 ℃, and the “fan” button. Adjust the pressure regulating valve of the pneumatic clamp of the tester to 0.3MPa ~ 0.4MPa, maintain the air makeup flow of the air makeup regulating valve at 50-70l / min, and preheat the whole machine for 5 minutes.
3. Add test aerosol solution (2% NaCl or dehs, DOP / Pao, paraffin oil aerosol solution) to the aerosol generator. The hose connection is correct. When changing different aerosol solutions, close the valve of the air compressor and ensure that the “spray” button switch is in the closed state, so as to prevent the solution in the aerosol generator from overflowing and corroding the panel of the tester.

The detailed operation process of the mask filtration efficiency test instrument is as follows:
1. Open the computer and double-click the filterstv1.0.0.8 automatic filter efficiency tester interface to open the mold, put in the test material, close the mold, adjust the test flow and reset (pressure reset).
2. Concentration adjustment setting: click “setting” for concentration adjustment, click “increase” and “decrease [-], and press” adjust “to set the current concentration value to 15000-16000 large [+].

The above is the detailed operation flow of the mask filtration efficiency test instrument. As a mask manufacturer and operator, of course, the premise is to buy a mask filter test instrument with good quality and appropriate price. LISUN launched GLE-20 is an oil-salt two-in-one Face Masks Particulate Filtration Efficiency PFE Tester. According to ASTM F1862-17, ASTM F2299-03 (2017), ASTM F2100-2019, BS EN14683-2019, BS EN 14387-2004+A1 2008, BS EN 136-1998, BS EN 140-1999, BS EN 143-2000 +C1-A1, BS EN 149-2001+A1, etc. It is used to test the particulate filtering efficiency of daily protective masks and medical masks, and to determine the obstruction performance of ordinary fabrics and medical protective masks against a constant flow of airflow. It is widely used for medical device inspection centers, safety protection inspection centers, labor protection inspection centers, drug inspection centers, disease prevention and control centers, textile testing centers, hospitals, mask manufacturers, etc.

WKS-1010 Mask Bacterial Filtration Efficiency (BFE) Tester is used to test the percentage of the mask material to filter out the suspended particles containing bacteria under the specified flow rate. It is suitable for the performance test of the bacterial filtration efficiency of medical surgical masks by metrological inspection departments, scientific research institutes, medical mask manufacturers and other related departments.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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Tags：GLE-20 , WKS-1010