What is an anti-particulate mask? What are the standards for anti-particulate masks?
What is an anti-particulate mask? What are the standards for anti-particulate masks? Anti-particulate masks are made of special filtering materials, relying on the three-dimensional structure design, to form a space sealed with the face, relying on human inhalation to force the polluted air to pass through the filter for breathing. The main protection objects are particulates, including dust, fog, smoke and microorganisms. And particles that can penetrate deep into the human lungs.
Anti-particulate masks use ear-hook headbands, which are not easy to fall off; Built-in nose strips, better sealing; Designed for Asian faces, more fit to the face; High-efficiency electrostatic filter cotton & melt-blown non-woven fabric, filtering efficiency is better than other masks higher.
Personal protective equipment whose purpose is to prevent or reduce dust in the air from entering the human respiratory organs to protect life;
2. Material: Most of the anti-particulate masks are made of two layers of non-woven fabric inside and outside, and a filter cloth (melt-blown cloth) in the middle layer;
3. Filtering principle: The filtering dust mainly depends on the middle filter cloth. Because the melt-blown cloth has the characteristics of static electricity, it can adsorb positive particles. Since the fine dust is adsorbed on the original filter, and the original filter is electrostatically charged and cannot be washed, the self-priming filter type anti-particulate respirator needs to replace the original filter regularly.
4. Remarks: International requirements for the use of anti-particulate masks are quite strict. Anti-particulate masks belong to the first level in personal protective equipment, higher than earmuffs and protective glasses. The more authoritative testing certifications are European CE certification and American NIOSH certification, while Chinese standards are similar to American NIOSH.
5. Protection object: The protection object is divided into KP and KN. The so-called KP can protect oily and non-oily particles, and KN can only protect non-oily particles.
6, protection level: China's protection level is divided into KP100, KP95, KP90 and KN100, KN95, KN90. Among them, KP100 and KN100 have the highest filtration efficiency, and the national standard requires greater than 99.97%, so it is also the safest for use.
Chinese National Standard
China's standards are similar to the United States, and are divided into two types, KN or KP (non-oily particles and oily particles, respectively). They are also three grades, KN90, KN95, and KN100. However, Chinese standards are not as strict as those in the United States, and their detection methods are slightly different.
The above inspection standards are tested with a particle size of 0.3 micrometers. The detection flow rate of the EU standard is 95L / min, and the US standard is 85L / min. The suspended particle size of China's national standard is more than 90% of<5 microns, more than 70% of < 2 microns, and the flow value is 42.5L / min.
When the carrier of some particulate matter is oily, and these substances are attached to the electrostatic non-woven fabric, it will reduce the electrical property and allow fine dust to penetrate. Therefore, the filter material containing anti-aerosol must undergo special electrostatic treatment to prevent fineness Purpose of dust. So each series is divided into 3 levels: 95%, 99%, 99.97% (ie 95, 99, 100 for short), so there are 9 categories of filter media.
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Fever L.//SMC Editor