1. Why do protective masks have different efficiency levels?
The efficiency level of protective masks comes from the provisions of national standards. Relevant government management departments stipulate that the performance of protective masks must meet the requirements of national standards and obtain the corresponding level of certification. That is to say, regular protective mask products must meet the requirements of a certain efficiency level of the national standard.
2. Is the higher the filtration efficiency of the protective mask, the better?
Why are different levels of efficiency specified in national standards?
The filtration efficiency of protective masks is not as high as possible. Generally, products with higher filtration efficiency may have correspondingly increased breathing resistance, which reduces wearing comfort and is not conducive to long-term use; at the same time, the cost may also increase accordingly. In the national standard, protective mask products are divided into several different efficiency levels. It is precisely to facilitate users to choose suitable products that can comprehensively meet the requirements of protective performance, comfort, economy, etc. according to the needs of the actual protection object and application environment. .
3. How to choose KN90, KN95 protective masks correctly?
The former State Administration of Work Safety stipulates: KN90 grade products, as the most basic protection, can be widely used for general dust, such as coal dust, cement dust, wood dust, mica dust, talc dust and other low-toxic dust. KN95 grade products are more suitable for protection against high toxicity hazards such as silicon dust, heavy metal dust (such as lead dust, cadmium dust), arsenic dust, and smoke (such as welding smoke, foundry smoke).
The actual protective effect of the mask is not only related to the filtration efficiency, but also depends on whether the mask can achieve a good fit with the face and whether it can minimize leakage. After choosing the efficiency level correctly, when choosing a product, you should choose a product that has good suitability and can closely fit more face shapes. A KN95-level mask that does not fit well may not have a better protective effect than a KN90-level mask that achieves a tight fit.
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