When choosing anti-fog masks, you should look at the implementation standards of the masks, observe the packaging and body of the product, Mask and see if there are clear approved implementation standards. Some manufacturers promote their compliance without the standard certification. Pay attention to These problems; when you buy,Mask you should pay attention to the description of the mask packaging to determine whether the material meets which standard; look at the brand of the mask, choose a regular manufacturer and a well-known brand, so that it will be guaranteed.
In addition, most medical masks are disposable. They cannot be cleaned and used again after use. If you find that the medical mask has expired, you should immediately replace it with a new one. Mask air tightness detection method: cover the mask with both hands as much as possible and conduct positive and negative pressure tests. Positive pressure test: cover the mask with both hands and exhale vigorously. If the air overflows from the edge of the mask, it is improperly worn, and the headband and nose metal strip must be adjusted again.
Negative pressure test: cover your mask with both hands and exhale vigorously. The center of the mask will sink. If air enters from the edge of the mask, it will be worn improperly. The headband and the metal strip of the nose bridge must be adjusted again. It must be noted that the side with the metal strip should be inward