口罩的分类（Classification of face masks）.doc

口罩的分类（Classification of face masks） Classification of face masks First, the National Institute of occupational safety and health (NIOSH) dust respiratory protection new standard 42CFR84 announced in June 8, 1995 (according to filter classification) N series: protect non oily suspended particles without time limit R series: protect non oily suspended particles and sweat oily suspended particles for eight hours P series: carrier protection non oil and suspended particles suspended particulate oily sweat no time limit some particles are oily, and these substances attached to the electrostatic non-woven fabric will reduce the electricity, the tiny dust penetration, so the material against the oil aerosol through electrostatic treatment, in order to achieve the fine dust prevention objective. So each series is divided into 3 levels: 95%, 99%, 99.97% (referred to as 95, 99100), so there are 9 kinds of filter materials. Two, EU EN149 standards: FFP1: minimum filter effect 80% FFP2: minimum filter effect 94% FFP3: minimum filter effect 97% Three Australia AS1716 standard P1: minimum filter effect 80% P2: minimum filter effect 94% P3: minimum filter effect 99% Three 、 Japanese MOL verification standard: DS1: DS2: minimum filter effect 99% DS3: minimum filter effect 99.9% Four, Taiwan region CNS standard: Five, China national standard GB6223-86 UDC 614.894: divided into four categories The above inspection standards are tested with 0.3 microns particle size. The EU standard test flow is 95L/min, and the United States standard is 85L/min. Our country GB uses suspension particle size 5 micron more than 90%, 2 micron above 70%, flow value is 42. 5L/min. In the inspection and certification of filter materials, the idea of worst case is adopted, that is, when the laboratory tests are done, the conditions are set up as the worst conditions. As with the efficiency of the experiment ammoniation sodium or DOP oil mist dust particle size of 0.3 microns in diameter calculation of gas dy