Be sure to understand the classification of these masks before buying masks
Since the covid-19 epidemic, masks have been established as necessary materials. We need to wear it every day when we go out. Before the outbreak of the epidemic, the most masks were produced in poultry farming, such as replacing poultry drinker cone valve for chicken, and producing glitter powder for Christmas decoration. Now because of the epidemic, everyone on the street is wearing a mask. Masks in different regions are also different, and there are many categories.
N series: no time limit for protection of non-oily suspended particles.
R series: Protection against non-oily suspended particles and sweat-oily suspended particles for eight hours.
P series: protection of non-oily suspended particles and sweat oily suspended particles without time limit.
When the carrier of some particulate matter is oily, and these substances attached to the electrostatic non-woven fabric will reduce the electrical properties and allow fine dust to penetrate. Therefore, the anti-aerosol-containing filter material must undergo special electrostatic treatment to prevent fineness. The purpose of dust. Therefore, each series is divided into 3 levels: 95%, 99%, 99.97% (referred to as 95, 99, 100 for short), so there are 9 sub-categories of filter media.
Australia AS1716 standard
P1: The minimum filtering effect is 80%
P2: The lowest filtering effect is 94%
European Union EN149 standard
- FFP1 masks: the lowest filtering effect is 80%
- FFP2 mask: the lowest filtering effect is 94%, buy CE Certified FFP2 NR Particulate respirator
- FFP3 masks: the lowest filtering effect is 97%
Japan MOL verification standard
According to Japan’s Decree No. 0207006 promulgated on February 7, 2005, the standards for dust masks are as follows
Chinese national standard GB6223-86UDC614.894
The above inspection standards except the Japanese standard (0.06-0.1 micron) are tested with a particle size of 0.3 micron. The detection flow rate of the EU standard is 95L/min, and the American standard is 85L/min. my country's national standard uses more than 90% of the suspended particle size of <5 microns, and more than 70% of <2 microns, and the flow value is 42.5L/min.
In the testing and certification of filter materials, the idea of "worst case" is adopted, that is, the conditions for testing in the laboratory are set as the worst. For example, the aerodynamic calculated diameter of the sodium salt of ammoniated salt or DOP oil mist used in the efficiency experiment is 0.3 microns, which represents the size of the extremely small particles that are most easily penetrated by the filter material. The breathing rate during hard physical work, the filter material must be pretreated with high temperature and humidity before the experiment, which represents the harsh working environment. All of these are designed to test if the filter material can pass the test under such harsh conditions. Reach the corresponding efficiency level, then in actual application, it will be able to protect the health of workers more effectively.
Anti-poisonous filter materials generally use activated carbon or chemically treated activated carbon as the material, and filter the poisonous gas or vapor through adsorption or chemical reaction without being inhaled by people. There are many micropores in the internal structure of activated carbon that can form a huge specific surface area. These micropores can inhale poisonous vapors and gas molecules of different molecular sizes without escaping. The treatment and installation requirements of activated carbon are very high. If the treatment is improper or the activated carbon particles are very coarse, resulting in gaps between the particles, the poisonous gas will penetrate into the respiratory tract from the gaps without being adsorbed. Therefore, it is very unscientific to replace the bagged activated carbon by yourself. The activated carbon in a good chemical filter box should be densely packed, with a small particle size and a large specific surface area, so that the anti-virus time will be long. At the same time, it should also consider the low respiratory resistance and comfortable wearing.
Air supply mask
It refers to a clean air source isolated from harmful substances, which is delivered to the face of a person through a tube and a mask through a power action such as a compressor, a compressed gas cylinder device, etc. for human breathing.
Air filter mask
Air filter masks are the most widely used category in daily work. The structure of an air filter mask should be divided into two parts. One is the main body of the mask, which can be simply understood as a mask frame; the other is the filter material part, including filter cotton for dust prevention and anti-virus, chemical filter cartridges, etc.
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