#1 High Quality Mask Manufacturer Alvent
Bacteria Filtration Efficiency (BFE)
Bacterial Filtration Efficiency, or BFE, is a measure of a respirator material's resistance to bacterial penetration. The percentage is reported as result and relates to the fabric's ability to resist bacterial penetration. Higher numbers indicate better barrier efficiency in this test.
Particle Filtration Efficiency (PFE)
Breathing Resistance (Pa)
The Differential Pressure Tester is a laboratory test tool to determine the breathability of medical face masks, the test principle is to test the air exchange pressure of the medical face mask material by measuring the differential pressure required to draw air from a constantly measured surface area. air flow rate indicates the breathability of medical face masks. An internal water filled differential manometer is used to measure differential pressure and a mass flow meter is used to measure air flow. The electric vacuum pump draws air from the medical mask breathability tester and a needle valve is used to adjust the air flow rate.
Particulate Matter (PM)
Liquid droplets in the air
PM50-70 Human Hair
As seen in the picture to the left, average human hair is between 50-70 PM. The hair piece looks very thick compared to other burning particles and organic compounds.
PM10 Dust & Smoke
PM 2.5 Fine Particles
PM 2.5 is almost 25 times smaller than a human hair or 40 times smaller than fine beach sand visible only under a microscope.