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Precautions for the use of masks

Update:16-12-2021
Summary:

1. When used for oily particulate protection, the accum […]

1. When used for oily particulate protection, the accumulative use time of class R does not exceed 8 hours at a time; the accumulative use time of class P does not exceed 40 hours, or the cumulative use time reaches 30 days from the start, whichever arrives earlier.

2. Protective masks cannot be washed with water, because washing with water will destroy the filter material and structure of the mask; if it is not contaminated or damaged, and meets the hygiene requirements, it can be considered for reuse.

3. N95 mask is not a product trademark or brand. N95 is the lowest level requirement of NIOSH (National Institute of Occupational Safety and Health) for the filtration efficiency level of American occupational anti-particulate respirators. The filtration efficiency of particulate matter (such as dust, paint mist, acid mist, microorganisms, etc.) is at least 95%.

4. The higher the filtering efficiency of the mask, the greater the resistance to breathing. Therefore, wearing N95 masks for a long time is not good for the body, so do not wear them for a long time.

5. Regarding the frequency of mask replacement, there is currently no clear conclusion, and my country has not yet made relevant regulations on the use time of masks. Some researchers have done related studies on the protection efficiency and wearing time of KN95 medical protective masks. The results show that KN95 masks are worn for 2 days, the filtration efficiency remains above 95%, the respiratory resistance changes little, and the filtration efficiency decreases to 94.7% after 3 days.

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