Masks Bacterial Filtration Efficiency (BFE) Tester is suitable 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.

Masks Bacterial Filtration Efficiency (BFE) Tester detection principle:

The particle filtration efficiency was measured with an automatic filter material tester, using sodium chloride aerosol in an environment of relative humidity (30±10) % and temperature (25±5) °C, the median number of sodium chloride aerosols The diameter is (0.075±0.020) 靘, and the geometric standard deviation of the particle distribution is ≤1.86. For the same product, using different test gas flow, the results of filtration efficiency are different. After experimental research, when the test gas flow increases, the filtration efficiency will decrease. Therefore, for the filtration efficiency, it must be specified under the test gas flow. .

In GB 19083, when the gas flow is 85 L/min, the filtration efficiency of the mask for non-oily particles should meet the following requirements: Grade 1 ≥ 95%; Grade 2 ≥ 99%; Grade 3 ≥ 99.97%. The pretreatment conditions of the masks were placed at (70±3) ℃ for 24h, and then at (-30±3) ℃ for 24h.

In YY 0469, when the gas flow is 30 L/min, the filtration efficiency of the mask for non-oily particles should be ≥30%. The masks were pretreated for (25±1) h in an environment with relative humidity (85±5) % and temperature (38±2.5) ℃.

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